Antibodies Targeting M-CSF

ABSTRACT

This disclosure generally relates to antibodies or antibody fragments which specifically bind to M-CSF. In particular antibodies and antibody fragments are disclosed which bind to M-CSF and which inhibit binding of M-CSF to the M-CSF receptor with an IC50 of 10 pM or less. The invention also relates to nucleic acids, vectors and host cells capable of expressing the antibodies or fragments thereof of the invention, pharmaceutical compositions comprising the antibodies or fragments thereof and uses of said antibodies or fragments thereof and compositions for treatment of specific diseases.

This disclosure generally relates to antibodies or antibody fragmentswhich specifically bind to M-CSF. In particular antibodies and antibodyfragments are disclosed which bind to M-CSF and which inhibit binding ofM-CSF to the M-CSF receptor with an IC50 of 10 pM or less. The inventionalso relates to nucleic acids, vectors and host cells capable ofexpressing the antibodies or fragments thereof of the invention,pharmaceutical compositions comprising the antibodies or fragmentsthereof and uses of said antibodies or fragments thereof andcompositions for treatment of specific diseases.

BACKGROUND OF THE INVENTION

M-CSF is a secreted cytokine which influences hematopoietic stem cellsto differentiate into macrophages or other related cell types. Theactive form of M-CSF is found extracellularly as a disulfide-linkedhomodimer. Three different isoforms of M-CSF are found extracellularly:secreted glycosylated M-CSF, secreted proteoglycan M-CSF, andcell-surface M-CSF.

M-CSF is a validated target for therapeutic invention, in particularlyfor the treatment of inflammatory disorders, such as e.g. rheumatoidarthritis. See e.g. U.S. Pat. No. 8,142,777 which is incorporated byreference. Several molecules are under development which target M-CSF,including antibody approaches. See e.g. WO2005/030124(Warner-Lambert/Pfizer) WO2005/068503 and (Chiron/Novartis).

The present disclosure provides novel antibodies and antibody fragmentswhich are superior to the anti-M-CSF antibodies known from the priorart. In particular, the antibodies and antibody fragments of the presentdisclosure specifically bind to M-CSF and inhibit the binding of M-CSFto the M-CSF receptor with an IC50 of 10 pM or less in a receptorbinding inhibition assay comprising M-CSF at a final concentration of12.5 pM. In addition, the antibodies exhibit functional properties whichare highly desirable for clinical development and which never have beenobserved before.

SUMMARY OF THE INVENTION

The present disclosure provides antibodies or antibody fragments whichspecifically bind to human M-CSF. The present disclosure also providesantibodies or antibody fragments which specifically bind to human M-CSFwith a certain affinity, e.g. an affinity of 30 pM or lower. The presentdisclosure also provides antibodies or antibody fragments whichspecifically bind to M-CSF and which inhibit binding of M-CSF to theM-CSF receptor with an IC50 of 10 pM or less. The present disclosurealso provides antibodies or antibody fragments which specifically bindsto M-CSF and wherein said isolated antibody or antibody fragment is ableto inhibit the binding of M-CSF to the M-CSF receptor with an IC50 of 10pM or less in a receptor binding inhibition assay comprising M-CSF at afinal concentration of 12.5 pM.

The present disclosure also provides specific antibodies or antibodyfragments as defined by way of the amino acid sequences of the six CDRregions. The present disclosure also provides specific antibodies orantibody fragments as defined by way of the amino acid sequences of thevariable heavy chain and the variable light chain.

The present disclosure also provides specific antibodies or antibodyfragments which compete with the specific antibodies or antibodyfragments disclosed herein. The present disclosure also providesspecific antibodies or antibody fragments which bind to the same epitopeas the specific antibodies or antibody fragments disclosed herein.

The present disclosure also provides the isolated antibody or antibodyfragment of the present disclosure use in medicine.

The present disclosure also provides also provides methods for treatingpatients suffering from a disorder, such as an inflammatory disorder, byadministering to said patient an effective amount of the antibodies orantibody fragments of the present disclosure.

The present disclosure also provides pharmaceutical compositionscomprising the isolated antibody or antibody fragment of the presentdisclosure, and a pharmaceutically acceptable carrier.

The present disclosure also provides nucleic acids encoding the antibodyor antibody fragment of the present disclosure.

The present disclosure also provides vector comprising nucleic acidsencoding the antibodies or antibody fragment antibodies of the presentdisclosure.

The present disclosure also provides host cell comprising vector ornucleic acids encoding the antibodies or antibody fragments of thepresent disclosure.

FIGURE LEGENDS

FIG. 1 demonstrates the ability of M-CSF-specific antibodies of thepresent disclosure to block the bioactivity of membrane-bound M-CSFisoform in an assay in which proliferation of M-NFS-60 cells was inducedby CHO cells stably expressing human membrane-bound M-CSF. Withincreasing antibody concentration all M-CSF-specific immunoglobulinsefficiently inhibit proliferation. In contrast, MOR03207 which isspecific for lysozyme failed to inhibit proliferation.

DETAILED DESCRIPTION

The term “isolated” refers to a compound that is substantially free ofother cellular materials and/or chemicals. If such compound is anantibody or antibody fragment then the term “isolated” refers to anantibody or antibody fragment that is also free of other antibodies orantigen binding moieties having different antigenic specificities.

The term “antibody” as used herein includes whole antibodies. Anaturally occurring “antibody” is a protein comprising at least twoheavy (H) chains and two light (L) chains inter- connected by disulfidebonds. Each heavy chain is comprised of a heavy chain variable region(abbreviated herein as VH) and a heavy chain constant region. The heavychain constant region is comprised specific CH domains (e.g. CH1, CH2and CH3). Each light chain is comprised of a light chain variable region(abbreviated herein as VL) and a light chain constant region. The lightchain constant region is comprised of one domain, CL. The VH and VLregions can be further subdivided into regions of hypervariability,termed complementary determining regions (CDR), interspersed withregions that are more conserved, termed framework regions (FR). Each VHand VL is composed of three CDRs and four FRs arranged fromamino-terminus to carboxy-terminus in the following order: FR1, CDR1,FR2, CDR2, FR3, CDR3, FR4. The constant regions of the antibodies maymediate the binding of the immunoglobulin to host tissues or factors,including various cells of the immune system (e.g., effector cells) andthe first component (C1q) of the classical complement system. Theantibodies can be of any isotype (e.g., IgG, IgE, IgM, IgD, IgA andIgY), class (e.g., IgG1, IgG2, IgG3, IgG4, IgA1 and IgA2), subclass ormodified version thereof (e.g. IgG1 LALA). The antibodies can be of anyspecies, chimeric, humanized or human.

The terms “heavy chain variable region CDR1” and “H-CDR1” are usedinterchangeably, as are the terms “heavy chain variable region CDR2” and“H-CDR2”, the terms “heavy chain variable region CDR3” and “H-CDR3”, theterms “light chain variable region CDR1” and “L-CDR1”; the terms “lightchain variable region CDR2” and “L-CDR2” and the terms “light chainvariable region CDR3” and “L-CDR3” antibody fragment

Antigen binding can be performed by “fragments” “antibody fragments”“antigen binding fragments” of an intact antibody. Herein, both termsare used interchangeably. Examples of binding fragments encompassedwithin the term “antibody fragment” of an antibody include a Fabfragment, a monovalent fragment consisting of the VL, VH, CL and CH1domains; a F(ab)2 fragment, a bivalent fragment comprising two Fabfragments linked by a disulfide bridge at the hinge region; an Fdfragment consisting of the VH and CH1 domains; an Fv fragment consistingof the VL and VH domains of a single arm of an antibody; a single domainantibody (dAb) fragment (Ward et al., (1989) Nature 341:544-546), whichconsists of a VH domain; and an isolated complementary determiningregion (CDR).

A “single chain Fragment (scFv)” is a single protein chain in which theVL and VH regions pair to form monovalent molecules (known as singlechain Fv (scFv); see, e.g., Bird et al., (1988) Science 242:423-426; andHuston et al., (1988) Proc. Natl. Acad. Sci. 85:5879-5883). Although thetwo domains VL and VH are coded for by separate genes, they can bejoined, using recombinant methods, by an artificial peptide linker thatenables them to be made as a single protein chain. Such single chainantibodies include one or more antigen binding moieties. These antibodyfragments are obtained using conventional techniques known to those ofskill in the art, and the fragments are screened for utility in the samemanner as are intact antibodies. In certain aspects the presentdisclosure provides antibody fragments, wherein said antibody fragmentis selected from the group consisting of a Fab, F(ab2)′, F(ab)2′ andscFV.

In certain aspects the present disclosure provides antibodies orantibody fragments, wherein said antibody or antibody fragment isbispecific. In certains aspects said antibody or antibody fragment is abispecific antibody-derived scaffold wherein said bispecificantibody-derived scaffold is selected from the group consisting of abispecific-scFv, a tetravalent bispecific antibody, a cross-linked Fabor a bispecific IgG.

In certain aspects the present disclosure provides to an antibody orantibody fragment, wherein the antibody or antibody fragment is selectedfrom the group consisting of single domain antibodies, maxibodies,minibodies, intrabodies, diabodies, triabodies, tetrabodies, v-NAR,camelid antibodies, ankyrins, domain antibodies, lipocalins, smallmodular immuno-pharmaceuticals, maxybodies, Protein A and affilins.

The terms “monoclonal antibody” as used herein refer to a preparation ofantibody molecules of single molecular composition. A monoclonalantibody composition displays a unique binding site having a uniquebinding specificity and affinity for particular epitopes. In certainaspects the present disclosure provides monoclonal antibodies orantibody fragments which specifically bind to M-CSF. In certain aspectsthe present disclosure provides polyclonal antibodies or antibodyfragments which specifically bind to M-CSF.

In certain aspect the disclosure provides an isolated antibody orantibody fragment which is cross-reactive to cynomolgus M-CSF. Incertain aspect the disclosure provides an isolated antibody or antibodyfragment which is cross-reactive to mouse M-CSF. In certain aspect thedisclosure provides an isolated antibody or antibody fragment which iscross-reactive to rat M-CSF. In certain aspect the disclosure providesan isolated antibody or antibody fragment which is cross-reactive tocynomolgus and/or mouse and/or rat M-CSF.

The term “human antibody”, as used herein, is intended to includeantibodies having variable regions in which both the framework and CDRregions are derived from sequences of human origin. As used herein, ahuman antibody comprises heavy or light chain variable regions or fulllength heavy or light chains. In certain cases, a human antibody may beat least 60%, 70%, 80%, 90%, or at least 95%, or even at least 96%, 97%,98%, or 99% identical in amino acid sequence to the amino acid sequenceencoded by the germline immunoglobulin gene. Thereby said human antibodycan be obtained from technology platforms which comprise antibodiesderived from human germline genes either generated by PCR-amplificationof VH/VL repertoire isolated from B-cells or are generatedsynthetically. Technology platforms include library based approachescomprising human immunoglobulin genes displayed on phage, ribosome oryeast. Respective display technologies are standard in the scientificcommunity. Furthermore immunization of a transgenic mouse carrying humanimmunoglobulin repertoire is another approach to generate humanantibodies against an antigen of interest. Antibodies or fragmentsthereof selected from an antibody library based on the MorphoSys HuCAL®concept (Knappik et al., (2000) J Mol Biol 296:57-86) are considered asfully human.

A “humanized” antibody is an antibody that retains the reactivity of anon-human antibody while being less immunogenic in humans. This can beachieved, for instance, by retaining the non-human CDR regions andreplacing the remaining parts of the antibody with their humancounterparts (i.e., the constant region as well as the frameworkportions of the variable region). See, e.g., Morrison et al (1994) Proc.Natl. Acad. Sci. USA, 81:6851-6855; Morrison and Oi (1988) Adv.Immunol., 44:65-92; Verhoeyen et al. (1988) Science, 239:1534-1536;Padlan, Molec (1991) Immun., 28:489-498; and Padlan, Molec (1994)Immun., 31:169-217. Other examples of human engineering technologyinclude, but are not limited to Xoma technology disclosed in U.S. Pat.No. 5,766,886.

The term “chimeric antibody” is an antibody molecule in which (a) theconstant region, or a portion thereof, is altered, replaced or exchangedso that the antigen binding site (variable region) is linked to aconstant region of a different or altered class, effector functionand/or species, or an entirely different molecule which confers newproperties to the chimeric antibody, e.g., an enzyme, toxin, hormone,growth factor, drug, etc.; or (b) the variable region, or a portionthereof, is altered, replaced or exchanged with a variable region havinga different or altered antigen specificity. For example, a mouseantibody can be modified by replacing its constant region with theconstant region from a human immunoglobulin. Due to the replacement witha human constant region, the chimeric antibody can retain itsspecificity in recognizing the antigen while having reduced antigenicityin human as compared to the original mouse antibody.

In certain aspects the present disclosure provides human antibodies andantibody fragments which specifically bind to M-CSF. In certain aspectsthe present disclosure provides humanized antibodies and antibodyfragments which specifically bind to M-CSF. In certain aspects thepresent disclosure provides chimeric antibodies and antibody fragmentswhich specifically bind to M-CSF. In certain aspects the presentdisclosure provides antibodies comprising a human heavy chain constantregion and a human light chain constant region.

The term “isotype” refers to the antibody class (e.g., IgM, IgE, IgGsuch as IgG1 or IgG4) that is provided by the heavy chain constantregion genes. Isotype also includes modified versions of one of theseclasses, where modifications have been made to alter the Fc function,for example, to enhance or reduce effector functions or binding to Fcreceptors. For example IgG1 LALA is a modified version of the IgGisotype having significantly reduced effector functions. Specificsubstitutions of amino acids reduced the binding affinity for Fc gammaRI receptor as compared with unmodified antibody. IgG1 LALA is describedin U.S. Ser. No. 08/479,752 (SCOTGEN BIOPHARMACEUTICALS INC.) which isincorporated by reference in its entirety. In certain embodiments of thepresent disclosure the antigen-binding moieties of are antibodies andare of the type IgG, IgM, IgA, IGE or IgD. In specific embodiments theantibodies are of the type IgG. In certain embodiments of the presentdisclosure the antibodies are of the subtype IgG1, IgG2, IgG3 or IgG4.In specific embodiments the antibodies are of the subtype IgG1 or IgG4.In other specific embodiments the antibodies are of the subtype IgG1 orIgG1 LALA.

In certain specific embodiments of the present disclosure, theantibodies are of a silent isotype. The term “silent” isotype refers toany immunoglobulin with a diminished effector function. Therefore, incertain embodiments of the present disclosure the antibody is of a IgG1subtype which has an effector function which is diminished compared tothe wild type IgG1 subtype. Certain mutations are particularly suited toachieve a diminished effector function. For example the IgG1 LALAsubtype is a typical silent isotype. Other silent versions of the IgG1isotype might be used with the antibodies of the present disclosure aswell. One specifically preferred example is the IgG1 isotype harboring aD265A mutation. In this IgG1 version the amino acid aspartic acid atposition 265 (numbering according to the EU index; seehttp://www.imqt.org/IMGTScientificChart/Numbering/Hu IGHGnber.html) isexchanged for an alanine residue. Therefore, in certain aspects theantibodies of the present disclosure are antibodies of a silent IgG1subtype. In alternative aspect the antibodies of the present disclosureare antibodies of a mutant IgG1 subtype which has decreased effector ascompared to the wildtype IgG1 subtype. In alternative aspects theantibodies of the present disclosure are antibodies of the IgG1 subtypecarrying a D265A mutation. In alternative aspect the antibodies of thepresent disclosure are antibodies of the IgG1 subtype wherein theaspartic acid at position 265 is exchanged for an alanine residue. Inalternative aspect the antibodies of the present disclosure areantibodies in which the aspartic acid residue at position 265 (numberingaccording to the EU index) is exchanged for an alanine residue.Thesubtypes IgG2 and IgG4 are also known as silent isotypes.

The term “affinity” as used herein refers to the strength of interactionbetween an antigen binding moiety, like e.g. a monoclonal antibody andan antigen at single antigenic sites. Within each antigenic site, thevariable region of the antibody “arm” interacts through weaknon-covalent forces with antigen at numerous sites; the moreinteractions, the stronger the affinity.

The term “specifically binds [to]” an antigen refers to a bindingreaction that is determinable in the presence of an antigen in aheterogeneous population of proteins and other biologics. Thereby thephrases “recognizing an antigen” and “specific for an antigen” are usedinterchangeably herein with the term “binds specifically to an antigen”.Specific binding of an antigen binding moiety, like e.g. a monoclonalantibody, to an antigen can be determined by various established methodsknown in the art and include ELISA, FACS, Western Blot, Immuno Blot,MSD, BlAcore and SET. In the present disclosure an antigen bindingmoiety is deemed to be specific for an antigen if the antigen bindingmoiety is demonstrated to be able to bind to a specific antigen at least2-fold, at least 3-fold, at least 4-fold, at least 5-fold, at least6-fold, at least 7-fold, at least 8-fold, at least 9-fold, at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least500-fold, at least 1000-fold over background. Thereby the background isdetermined by an antigen binding moiety which is known to be unspecificfor the selected antigens or by comparison to binding to an unrelatedantigen. The antigen for the inventive antibodies and antibody fragmentsof the present invention is M-CSF.

The full-length human M-CSF precursor (also known as CSF-1 or macrophagecolony-stimulating-factor) has a length of 554 amino acids. The aminoacid sequence of human M-CSF precursor is shown in SEQ ID No.: 1(source: Uniprot, human M-CSF P09603).

SEQ ID NO.: 1 (full-length human M-CSF precursor):MTAPGAAGRCPPTTWLGSLLLLVCLLASRSITEEVSEYCSHMIGSGHLQSLQRLIDSQMETSCQITFEFVDQEQLKDPVCYLKKAFLLVQDIMEDTMRFRDNTPNAIAIVQLQELSLRLKSCFTKDYEEHDKACVRTFYETPLQLLEKVKNVFNETKNLLDKDWNIFSKNCNNSFAECSSQDVVTKPDCNCLYPKAIPSSDPASVSPHQPLAPSMAPVAGLTWEDSEGTEGSSLLPGEQPLHTVDPGSAKQRPPRSTCQSFEPPETPVVKDSTIGGSPQPRPSVGAFNPGMEDILDSAMGTNWVPEEASGEASEIPVPQGTELSPSRPGGGSMQTEPARPSNFLSASSPLPASAKGQQPADVTGTALPRVGPVRPTGQDWNHTPQKTDHPSALLRDPPEPGSPRISSLRPQGLSNPSTLSAQPQLSRSHSSGSVLPLGELEGRRSTRDRRSPAEPEGGPASEGAARPLPRFNSVPLTDTGHERQSEGSFSPQLQESVFHLLVPSVILVLLAVGGLLFYRWRRRSHQEPQRADSPLEQPEGSPLTQDDRQV ELPV

Three different extracellular isoforms of M-CSF are expressed as aconsequence of splicing and post-translational modifications: secretedglycosylated M-CSF (“sgM-CSF”), secreted proteoglycan M-CSF (“spM-CSF”),and cell-surface M-CSF (“csM-CSF”).

The most predominant isoform in human serum is sgM-CSF which isgenerated by cleavage of the M-CSF precursor at position 255. The aminoacid sequence of human sgM-CSF is shown in SEQ ID No.: 2.

SEQ ID NO.: 2 (human secreted glycosylated M-CSF(fragment 33-255 of SEQ. 1)):EEVSEYCSHMIGSGHLQSLQRLIDSQMETSCQITFEFVDQEQLKDPVCYLKKAFLLVQDIMEDTMRFRDNTPNAIAIVQLQELSLRLKSCFTKDYEEHDKACVRTFYETPLQLLEKVKNVFNETKNLLDKDWNIFSKNCNNSFAECSSQDVVTKPDCNCLYPKAIPSSDPASVSPHQPLAPSMAPVAGLTWEDSEGTEGSSLLPGEQPLHTVDPGSAKQRPPR

Human secreted proteoglycan M-CSF has a length of 456 amino acids. Theamino acid sequence of spM-CSF is shown in SEQ ID NO.: 3.

SEQ ID NO: 3 (human secreted proteoglycan M-CSF)EEVSEYCSHMIGSGHLQSLQRLIDSQMETSCQITFEFVDQEQLKDPVCYLKKAFLLVQDIMEDTMRFRDNTPNAIAIVQLQELSLRLKSCFTKDYEEHDKACVRTFYETPLQLLEKVKNVFNETKNLLDKDWNIFSKNCNNSFAECSSQDVVTKPDCNCLYPKAIPSSDPASVSPHQPLAPSMAPVAGLTWEDSEGTEGSSLLPGEQPLHTVDPGSAKQRPPRSTCQSFEPPETPVVKDSTIGGSPQPRPSVGAFNPGMEDILDSAMGTNWVPEEASGEASEIPVPQGTELSPSRPGGGSMQTEPARPSNFLSASSPLPASAKGQQPADVTGTALPRVGPVRPTGQDWNHTPQKTDHPSALLRDPPEPGSPRISSLRPQGLSNPSTLSAQPQLSRSHSSGSVLPLGELEGRRSTRDRRSPAEPEGGPASEGAARPLPRFNSVPLTDTGHE RQSEGS

The human cell-surface M-CSF is generated by alternative splicing andhas a length of 256 amino acids. The amino acid sequence of csM-CSF isshown in SEQ ID NO.: 4.

SEQ ID NO.: 4 (human cell surface M-CSF)EEVSEYCSHMIGSGHLQSLQRLIDSQMETSCQITFEFVDQEQLKDPVCYLKKAFLLVQDIMEDTMRFRDNTPNAIAIVQLQELSLRLKSCFTKDYEEHDKACVRTFYETPLQLLEKVKNVFNETKNLLDKDWNIFSKNCNNSFAECSSQGHERQSEGSSSPQLQESVFHLLVPSVILVLLAVGGLLFYRWRRRSHQEPQRADSPLEQPEGSPLTQDDRQVELPV

All 3 isoforms of M-CSF can bind to the M-CSF receptor and arebiologically active. The three isoforms have in common the N-terminalreceptor-binding domain (rbdM-CSF), the amino acid sequence of which isshown in SEQ ID NO.: 5.

SEQ ID NO.: 5 (human receptor binding domain M-CSF (fragment 33-190))EEVSEYCSHMIGSGHLQSLQRLIDSQMETSCQITFEFVDQEQLKDPVCYLKKAFLLVQDIMEDTMRFRDNTPNAIAIVQLQELSLRLKSCFTKDYEEHDKACVRTFYETPLQLLEKVKNVFNETKNLLDKDWNIFSKNCNNSFAECSSQD VVTKPDCN

The antibodies and antibody fragments of the present disclosure alsobind to M-CSF of cynomolgus monkeys (Macaca fascicularis), which arefrequently used in the laboratory for pre-clinical studies. The nucleicacid molecule encoding secreted glycoprotein M-CSF of cynomolgus wascloned by standard PCR techniques from cynomolgus cDNA prepared frombreast or pancreas tissues. The sequence of cynomolgus sgM-CSF is shownin SEQ ID NO.: 6.

SEQ ID NO.: 6 (cynomolgus sgM-CSF):EEVSEYCSHMIGSGHLQSLQRLIDSQMETSCQITFEFVDQEQLKDPVCYLKKAFLLVQDIMEDTMRFRDNTPNAIAIVQLQELSLRLKSCFTKDYEEHDKACVRTFYETPLQLLEKVKNVFNETKNLLDKDWNIFSKNCNNSFAECSSQDVVTKPDCNCLYPKAIPSSDPASVSPHQPLAPSMAPMAGLTWDDSEGTEGSSLLPGEQPLHTVDPGSAKQRPPR

Human M-CSF receptor (also known as M-CSFR or CSF1R) has a length of 972amino acids. The amino acid sequence of human M-CSFR is shown in SEQ IDNo.: 7 (source: Uniprot, human M-CSFR P07333):

SEQ ID NO.: 7 (human M-CSFR):MGPGVLLLLLVATAWHGQGIPVIEPSVPELVVKPGATVTLRCVGNGSVEWDGPPSPHWTLYSDGSSSILSTNNATFQNTGTYRCTEPGDPLGGSAAIHLYVKDPARPWNVLAQEVVVFEDQDALLPCLLTDPVLEAGVSLVRVRGRPLMRHTNYSFSPWHGFTIHRAKFIQSQDYQCSALMGGRKVMSISIRLKVQKVIPGPPALTLVPAELVRIRGEAAQIVCSASSVDVNFDVFLQHNNTKLAIPQQSDFHNNRYQKVLTLNLDQVDFQHAGNYSCVASNVQGKHSTSMFFRVVESAYLNLSSEQNLIQEVTVGEGLNLKVMVEAYPGLQGFNWTYLGPFSDHQPEPKLANATTKDTYRHTFTLSLPRLKPSEAGRYSFLARNPGGWRALTFELTLRYPPEVSVIWTFINGSGTLLCAASGYPQPNVTWLQCSGHTDRCDEAQVLQVWDDPYPEVLSQEPFHKVTVQSLLTVETLEHNQTYECRAHNSVGSGSWAFIPISAGAHTHPPDEFLFTPVVVACMSIMALLLLLLLLLLYKYKQKPKYQVRWKIIESYEGNSYTFIDPTQLPYNEKWEFPRNNLQFGKTLGAGAFGKVVEATAFGLGKEDAVLKVAVKMLKSTAHADEKEALMSELKIMSHLGQHENIVNLLGACTHGGPVLVITEYCCYGDLLNFLRRKAEAMLGPSLSPGQDPEGGVDYKNIHLEKKYVRRDSGFSSQGVDTYVEMRPVSTSSNDSFSEQDLDKEDGRPLELRDLLHFSSQVAQGMAFLASKNCIHRDVAARNVLLTNGHVAKIGDFGLARDIMNDSNYIVKGNARLPVKWMAPESIFDCVYTVQSDVWSYGILLWEIFSLGLNPYPGILVNSKFYKLVKDGYQMAQPAFAPKNIYSIMQACWALEPTHRPTFQQICSFLQEQAQEDRRERDYTNLPSSSRSGGSGSSSSELEEESSSEHLTCCEQGDIAQPLLQPNNYQFC

The antibodies and antibody fragments of the present disclosure alsoinhibit the binding cynomolgus M-CSF to the cynomolgus M-CSF receptor.

In certain aspects the present disclosure relates to an isolatedantibody or antibody fragment which is directed against or specificallybinds to the human M-CSF. In alternative aspects the present disclosurerelates to an isolated antibody or antibody fragment which is directedagainst or specifically binds to the polypeptide encoded by SEQ ID NO.:1.

In certain aspects the present disclosure relates to an isolatedantibody or antibody fragment which is directed against or specificallybinds to the cynomolgus M-CSF. In alternative aspects the presentdisclosure relates to an isolated antibody or antibody fragment which isdirected against or specifically binds to the polypeptide encoded by SEQID NO.: 6.

In certain aspects the present disclosure relates to an isolatedantibody or antibody fragment which is directed against or specificallybinds to the human M-CSF and which inhibits binding of human M-CSF tothe human M-CSF receptor. In alternative aspects the present disclosurerelates to an isolated antibody or antibody fragment which is directedagainst or specifically binds to the polypeptide encoded by SEQ ID NO.:1 and which inhibits binding of the polypeptide encoded by SEQ ID NO.: 1to the polypeptide encoded by SEQ ID NO.: 7.

In certain aspects the present disclosure relates to an isolatedantibody or antibody fragment which is directed against or specificallybinds to the cynomolgus M-CSF and which inhibits binding of cynomolgusM-CSF to the cynomolgus M-CSF receptor. In alternative aspects thepresent disclosure relates to an isolated antibody or antibody fragmentwhich is directed against or specifically binds to the polypeptideencoded by SEQ ID NO.: 6 and which inhibits binding of the polypeptideencoded by SEQ ID NO.: 6 to the polypeptide encoded by SEQ ID NO.: 7. Inalternative aspects the present disclosure relates to an isolatedantibody or antibody fragment which is directed against or specificallybinds to the polypeptide encoded by SEQ ID NO.: 6 and which inhibitsbinding of the polypeptide encoded by SEQ ID NO.: 6 to the cynomolgusM-CSF receptor.

In certain aspects the present disclosure relates to an isolatedantibody or antibody fragment which binds to secreted glycosylatedM-CSF, secreted proteoglycan M-CSF and cell-surface M-CSF. In certainaspects the present disclosure relates to an isolated antibody orantibody fragment which binds to all isoforms of human M-CSF. In certainaspects the present disclosure relates to an isolated antibody orantibody fragment which binds to a polypeptide encoded by SEQ ID NO.: 2,a polypeptide encoded by SEQ ID NO.: 3 and a polypeptide encoded by SEQID NO.: 4.

In certain aspects the present disclosure relates to an isolatedantibody or antibody fragment which binds to the N-terminalreceptor-binding domain of M-CSF. In certain aspects the presentdisclosure relates to an isolated antibody or antibody fragment whichbinds to a polypeptide encoded by SEQ ID NO.: 5.

The terms “polypeptide” and “protein” are used interchangeably herein torefer to a polymer of amino acid residues. The terms apply to amino acidpolymers in which one or more amino acid residue is an artificialchemical mimetic of a corresponding naturally occurring amino acid, aswell as to naturally occurring amino acid polymers and non-naturallyoccurring amino acid polymer. Unless otherwise indicated, a particularpolypeptide sequence also implicitly encompasses conservatively modifiedvariants thereof.

The term “nucleic acid” is used herein interchangeably with the term“polynucleotide” and refers to deoxyribonucleotides or ribonucleotidesand polymers thereof in either single- or double-stranded form. The termencompasses nucleic acids containing known nucleotide analogs ormodified backbone residues or linkages, which are synthetic, naturallyoccurring, and non-naturally occurring, which have similar bindingproperties as the reference nucleic acid, and which are metabolized in amanner similar to the reference nucleotides. Examples of such analogsinclude, without limitation, phosphorothioates, phosphoramidates, methylphosphonates, chiral-methyl phosphonates, 2-O-methyl ribonucleotides,peptide-nucleic acids (PNAs). Unless otherwise indicated, a particularnucleic acid sequence also implicitly encompasses conservativelymodified variants thereof (e.g., degenerate codon substitutions) andcomplementary sequences, as well as the sequence explicitly indicated.Specifically, as detailed below, degenerate codon substitutions may beachieved by generating sequences in which the third position of one ormore selected (or all) codons is substituted with mixed-base and/ordeoxyinosine residues (Batzer et al. (1991) Nucleic Acid Res. 19:5081;Ohtsuka et al. (1985) J. Biol. Chem. 260:2605-2608; and Rossolini et al.(1994) Mol. Cell. Probes 8:91-98).

In certain aspects the present disclosure provides a nucleic acidencoding an antibody or antibody fragment according to the presentdisclosure which specifically binds to M-CSF. In certain aspects thepresent disclosure provides a nucleic acid encoding an antibody orantibody fragment of Table 1. In certain aspects the present disclosureprovides a nucleic acid encoding an antibody or antibody fragment ofTable 2.

In certain aspects the present disclosure provides a vector comprising anucleic acid encoding an antibody or antibody fragment according to thepresent disclosure which specifically binds to M-CSF. In certain aspectsthe present disclosure provides a vector comprising a nucleic acidencoding an antibody or antibody fragment of Table 1. In certain aspectsthe present disclosure provides a vector comprising a nucleic acidencoding an antibody or antibody fragment of Table 2.

In certain aspects the present disclosure provides a host cellcomprising a vector comprising a nucleic acid encoding an antibody orantibody fragment of the present disclosure. In certain aspects thepresent disclosure provides a host cell comprising a nucleic acidencoding an antibody or antibody fragment of the present disclosure.

The term “recombinant host cell” (or simply “host cell”) refers to acell into which a recombinant expression vector has been introduced. Itshould be understood that such terms are intended to refer not only tothe particular subject cell but to the progeny of such a cell. Becausecertain modifications may occur in succeeding generations due to eithermutation or environmental influences, such progeny may not, in fact, beidentical to the parent cell, but are still included within the scope ofthe term “host cell” as used herein.

The term “vector” refers to a polynucleotide molecule capable oftransporting another polynucleotide to which it has been linked. Onetype of vector is a “plasmid”, which refers to a circular doublestranded DNA loop into which additional DNA segments may be ligated.Another type of vector is a viral vector, wherein additional DNAsegments may be ligated into the viral genome. Certain vectors arecapable of autonomous replication in a host cell into which they areintroduced (e.g., bacterial vectors having a bacterial origin ofreplication and episomal mammalian vectors). Other vectors (e.g.,non-episomal mammalian vectors) can be integrated into the genome of ahost cell upon introduction into the host cell, and thereby arereplicated along with the host genome. Moreover, certain vectors arecapable of directing the expression of genes to which they areoperatively linked. Such vectors are referred to herein as “recombinantexpression vectors” (or simply, “expression vectors”). In general,expression vectors of utility in recombinant DNA techniques are often inthe form of plasmids. In the present specification, “plasmid” and“vector” may be used interchangeably as the plasmid is the most commonlyused form of vector. However, the disclosure is intended to include suchother forms of expression vectors, such as viral vectors (e.g.,replication defective retroviruses, adenoviruses and adeno-associatedviruses), which serve equivalent functions.

In certain aspects the present disclosure provides isolated antibodiesor antibody fragment, which specifically binds to M-CSF and whichinhibits binding of M-CSF to the M-CSF receptor with an IC50 of 10 pM orless. In other aspect said isolated antibodies or antibody fragmentinhibits binding of M-CSF to the M-CSF receptor with an 1050 of 20 pM orless, an IC50 of 5.5 pM or less or an 1050 of 5 pM or less.

In certain aspects the present disclosure provides isolated antibody orantibody fragment, which specifically binds to M-CSF and wherein saidisolated antibody or antibody fragment is able to inhibit the binding ofM-CSF to the M-CSF receptor with an IC50 of 10 pM or less in a receptorbinding inhibition assay comprising M-CSF at a final concentration of12.5 pM.

In certain aspects the present disclosure provides isolated antibody orantibody fragment, which specifically binds to M-CSF and wherein saidisolated antibody or antibody fragment is able to inhibit the binding ofM-CSF to the M-CSF receptor with an IC50 of 10 pM or less in a receptorbinding inhibition assay comprising M-CSF at a final concentration of0.66 ng/ml and M-CSF receptor at a final concentration of 2 μg/ml.

In certain aspects the present disclosure provides isolated antibody orantibody fragment, which specifically binds to M-CSF and wherein saidisolated antibody or antibody fragment is able to inhibit the binding ofM-CSF to the M-CSF receptor with an IC50 of 10 pM or less in a receptorbinding inhibition assay as described in Example 5.

In certain aspects the present disclosure provides isolated antibodiesor antibody fragment, which specifically binds to M-CSF and whichinhibits binding of M-CSF to the M-CSF receptor with an IC50 which is atleast twice as low as the IC50 of any one of the prior art antibodiesHeRX1-10G1 and 8.10.3F. In alternative said isolated antibodies orantibody fragment inhibits binding of M-CSF to the M-CSF receptor withan IC50 which is at least three times as low as the IC50 of any one ofthe prior art antibodies HeRX1-10G1 and 8.10.3F.

In certain aspects the present disclosure provides isolated antibodiesor antibody fragment, which specifically binds to M-CSF with an EC50 of10 pM or less as determined in a FACS assay. In alternative aspects saidisolated antibodies or antibody fragments specifically bind to M-CSFwith an EC50 of 15 pM or less as determined in a FACS assay or with anEC50 of 5 pM or less as determined in a FACS assay.

In certain aspects the present disclosure provides isolated antibodiesor antibody fragment, which specifically binds to M-CSF with an EC50which is at least twice as low as the EC50 of any one of the prior artantibodies HeRX1-10G1 or 8.10.3F as determined in a FACS assay.

In certain aspects the present disclosure provides isolated antibodiesor antibody fragment, which specifically binds to M-CSF and whichinhibits M-CSF induced proliferation with an IC50 of 10 pM or less. Inalternative aspects said isolated antibodies or antibody fragmentsinhibits M-CSF induced proliferation with an IC50 of 20 pM or less, withan IC50 of 15 pM or less or with an IC50 of 5 pM or less.

In certain aspects the present disclosure provides isolated antibodiesor antibody fragment, which specifically binds to M-CSF and whichinhibits M-CSF induced proliferation with an IC50 which is at leasttwice as low as the IC50 of any one of the prior art antibodiesHeRX1-10G1 or 8.10.3F.

The term “KD”, as used herein, refers to the dissociation constant,which is obtained from the ratio of Kd to Ka (i.e. Kd/Ka) and isexpressed as a molar concentration (M). KD values for antigen bindingmoieties like e.g. monoclonal antibodies can be determined using methodswell established in the art. Methods for determining the KD of anantigen binding moiety like e.g. a monoclonal antibody are SET (solubleequilibrium titration) or surface plasmon resonance using a biosensorsystem such as a Biacore® system. Antibodies of the present disclosuretypically have a dissociation rate constant (KD) (koff/kon) of less than5×10⁻²M, less than 10⁻²M, less than 5×10⁻³M, less than 10⁻³M, less than5×10⁻⁴M, less than 10⁻⁴M, less than 5×10⁻⁵M, less than 10⁻⁵M, less than5×10⁻⁶M, less than 10⁻⁶M, less than 5×10⁻⁷M, less than 10⁻⁷M, less than5×10⁻⁸M, less than 10⁻⁸M, less than 5×10⁻⁹M, less than 10⁻⁹M, less than5×10⁻¹⁰M, less than 10-10M, less than 5×10-11M, less than 10⁻¹¹M, lessthan 5×10⁻¹²M, less than 10⁻¹²M, less than 5×10⁻¹³M, less than 10⁻¹³M,less than 5×10⁻¹⁴M, less than 10⁻¹⁴M, less than 5×10⁻¹⁵M, or less than10⁻¹⁵M or lower.

In certain aspect, the present disclosure provides an isolated antibodyor antibody fragment specific for M-CSF, wherein said antibody orantibody fragment binds to a M-CSF, with a dissociation constant (KD) ofless than 1×10⁷ M⁻¹, 10⁸ M⁻¹, 10⁹ M⁻¹, 10¹⁰ M⁻¹, 10¹¹ M⁻¹, 10¹² M or10¹³ M⁻¹.

The term “EC50”, as used herein, refers to the concentration of anantibody or an antibody fragment which induces a response in an assayhalf way between the baseline and maximum. It therefore represents theantibody concentration at which 50% of the maximal effect is observed.

The term “IC50”, as used herein, refers to the concentration of aninhibitor (e.g. an antibody or antibody fragment) that inhibits aresponse in an assay half way between the maximal response and thebaseline. It represents the antibody concentration that reduces a givenresponse by 50%.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 8, the HCDR2 region of SEQ IDNO.: 9, the HCDR3 region of SEQ ID NO.: 10, the LCDR1 region of SEQ IDNO.: 11, the LCDR2 region of SEQ ID NO.: 12 and the LCDR3 region of SEQID NO.: 13.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 18, the HCDR2 region of SEQ IDNO.: 19, the HCDR3 region of SEQ ID NO.: 20, the LCDR1 region of SEQ IDNO.: 21, the LCDR2 region of SEQ ID NO.: 22 and the LCDR3 region of SEQID NO.: 23.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 28, the HCDR2 region of SEQ IDNO.: 29, the HCDR3 region of SEQ ID NO.: 30, the LCDR1 region of SEQ IDNO.: 31, the LCDR2 region of SEQ ID NO.: 32 and the LCDR3 region of SEQID NO.: 33.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 38, the HCDR2 region of SEQ IDNO.: 39, the HCDR3 region of SEQ ID NO.: 40, the LCDR1 region of SEQ IDNO.: 41, the LCDR2 region of SEQ ID NO.: 42 and the LCDR3 region of SEQID NO.: 43.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 48, the HCDR2 region of SEQ IDNO.: 49, the HCDR3 region of SEQ ID NO.: 50, the LCDR1 region of SEQ IDNO.: 51, the LCDR2 region of SEQ ID NO.: 52 and the LCDR3 region of SEQID NO.: 53.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 58, the HCDR2 region of SEQ IDNO.: 59, the HCDR3 region of SEQ ID NO.: 60, the LCDR1 region of SEQ IDNO.: 61, the LCDR2 region of SEQ ID NO.: 62 and the LCDR3 region of SEQID NO.: 63.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 68, the HCDR2 region of SEQ IDNO.: 69, the HCDR3 region of SEQ ID NO.: 70, the LCDR1 region of SEQ IDNO.: 71, the LCDR2 region of SEQ ID NO.: 72 and the LCDR3 region of SEQID NO.: 73.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 78, the HCDR2 region of SEQ IDNO.: 79, the HCDR3 region of SEQ ID NO.: 80, the LCDR1 region of SEQ IDNO.: 81, the LCDR2 region of SEQ ID NO.: 82 and the LCDR3 region of SEQID NO.: 83.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 88, the HCDR2 region of SEQ IDNO.: 89, the HCDR3 region of SEQ ID NO.: 90, the LCDR1 region of SEQ IDNO.: 91, the LCDR2 region of SEQ ID NO.: 92 and the LCDR3 region of SEQID NO.: 93.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 98, the HCDR2 region of SEQ IDNO.: 99, the HCDR3 region of SEQ ID NO.: 100, the LCDR1 region of SEQ IDNO.: 101, the LCDR2 region of SEQ ID NO.: 102 and the LCDR3 region ofSEQ ID NO.: 103.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the HCDR1 region of SEQ ID NO.: 108, the HCDR2 region of SEQID NO.: 109, the HCDR3 region of SEQ ID NO.: 110, the LCDR1 region ofSEQ ID NO.: 111, the LCDR2 region of SEQ ID NO.: 112 and the LCDR3region of SEQ ID NO.: 113.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 14 and the variablelight region of SEQ ID NO.: 15.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 24 and the variablelight region of SEQ ID NO.: 25.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 34 and the variablelight region of SEQ ID NO.: 35.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 44 and the variablelight region of SEQ ID NO.: 45.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 54 and the variablelight region of SEQ ID NO.: 55.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 64 and the variablelight region of SEQ ID NO.: 65.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 74 and the variablelight region of SEQ ID NO.: 75.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 84 and the variablelight region of SEQ ID NO.: 85.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 94 and the variablelight region of SEQ ID NO.: 95.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 104 and the variablelight region of SEQ ID NO.: 105.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments, wherein said antibody or antibody fragmentcomprises the variable heavy region of SEQ ID NO.: 114 and the variablelight region of SEQ ID NO.: 115.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments which compete with the antibodies specificallydisclosed herein for binding to M- CSF. In other aspects the presentdisclosure provides isolated antibodies and antibody fragments whichcompete with the antibodies specifically disclosed herein for binding tohuman M-CSF. In other aspects the present disclosure provides isolatedantibodies and antibody fragments which compete with the antibodiesspecifically disclosed herein for binding to a polypeptide encoded bySEQ ID NO.: 1.

The term “competes” or “cross-competes” refers to an antibody orantibody fragment which shares the ability to bind to a specific regionof an antigen. In the present disclosure an antibody or antibodyfragment that is “cross-competitive” has the ability to interfere withthe binding of another antibody or antibody fragment for M-CSF in astandard competitive binding assay. Such an antibody may, according tonon-limiting theory, bind to the same or a related or nearby (e.g., astructurally similar or spatially proximal) epitope on M-CSF.Cross-competition studies to find antibodies that competitively bindwith one another, e.g., the antibodies compete for binding to theantigen can be performed. The ability or extent to which an antibody orantibody fragment is able to interfere with the binding of anotherantibody or antibody fragment to M-CSF and therefore whether it can besaid to cross-compete according to the invention, can be determinedusing standard competition binding assays. Cross-competition is presentif antibody A reduces binding of antibody B at least by 50%, at least by60%, specifically at least by 70% and more specifically at least by 80%and vice versa in comparison to the positive control which lacks one ofsaid antibodies. As the skilled artisan appreciates competition may beassessed in different assay set-ups. One suitable assay involves the useof the Biacore technology (e.g. by using the BlAcore 3000 instrument(Biacore, Uppsala, Sweden)), which can measure the extent ofinteractions using surface plasmon resonance technology. Another assayfor measuring cross-competition uses an ELISA-based approach.Furthermore, a high throughput process for “binning” antibodies basedupon their cross-competition is described in International PatentApplication No. WO2003/48731. Cross-competition is present if theantibody under investigation reduces the binding of one of theantibodies by 60% or more, specifically by 70% or more and morespecifically by 80% or more and if one of the antibodies reduces thebinding of said antibody to M-CSF by 60% or more, specifically by 70% ormore and more specifically by 80% or more.

In certain aspect the present disclosure pertains to an antibody orantibody fragment specific for M-CSF, that cross-competes with anantibody described in Table 1. In certain aspect the present disclosurepertains to an antibody or antibody fragment specific for M- CSF, thatcross-competes with an antibody described in Table 2.

In a certain embodiment, the antibody or antibody fragment thatcross-competes with an antibody described in Table 1 reduces the bindingof one of the antibodies described in Table 1 to M-CSF, by at least 50%,60%, 70%, 80% or 90% in an ELISA-based cross-competition assay. In acertain embodiment, the antibody or antibody fragment thatcross-competes with an antibody described in Table 2 reduces the bindingof one of the antibodies described in Table 2 to M-CSF, by at least 50%,60%, 70%, 80% or 90% in an ELISA-based cross- competition assay.

In certain aspects the present disclosure provides isolated antibodiesand antibody fragments which bind to the same epitope like theantibodies specifically disclosed herein. In certain aspects the presentdisclosure provides isolated antibodies and antibody fragments whichbind to the same epitope like the antibodies described in Table 1. Incertain aspects the present disclosure provides isolated antibodies andantibody fragments which bind to the same epitope like the antibodiesdescribed in Table 2.

The term “epitope” includes any proteinacious region which isspecifically recognized by an immunoglobulin or T-cell receptor orotherwise interacts with a molecule. Generally epitopes are ofchemically active surface groupings of molecules such as amino acids orcarbohydrate or sugar side chains and generally may have specificthree-dimensional structural characteristics, as well as specific chargecharacteristics. As will be appreciated by one of skill in the art,practically anything to which an antibody can specifically bind could bean epitope.

In certain aspect, the present disclosure pertains to an antibody orantibody fragment specific for M-CSF which interacts with (e.g., bybinding, stabilizing, spatial distribution) the same epitope as anantibody described in Table 1. In certain aspect, the disclosurepertains to an antibody or antibody fragment specific for M-CSF whichinteracts with (e.g., by binding, stabilizing, spatial distribution) thesame epitope as an antibody described in Table 2.

In certain aspect, the present disclosure pertains to an antibody orantibody fragment disclosed herein for use in medicine.

In certain aspect the disclosure provides to a pharmaceuticalcomposition comprising an isolated antibody or antibody fragment whichis directed against or binds to M-CSF, and a pharmaceutically acceptablecarrier. In certain aspects, the present invention provides apharmaceutical composition comprising an isolated antibody or antibodyfragment of the present disclosure, and a pharmaceutically acceptablecarrier. In another embodiment the isolated antibody or antibodyfragments disclosed herein for use as a drug.

The compositions of the present invention are preferably pharmaceuticalcompositions comprising an isolated antibody or antibody fragment whichis directed against or binds to M-CSF and a pharmaceutically acceptablecarrier, diluent or excipient, for the treatment of an inflammatorydisorder. Such carriers, diluents and excipients are well known in theart, and the skilled artisan will find a formulation and a route ofadministration best suited to treat a subject with the anti-MCSFantibodies or antibody fragments of the present invention.

In certain aspects, the present invention provides a method for thetreatment or prophylaxis of an inflammatory disorder in a subject,comprising the step of administering to the subject an effective amountof an antibody or antibody fragment, which is directed against or bindsto M-CSF. In certain aspects said subject is a human. In alternativeaspects said subject is a rodent, such as a rat or a mouse.

“Administration” and “treatment,” as it applies to an animal, human,experimental subject, cell, tissue, organ, or biological fluid, refersto contact of an exogenous pharmaceutical, therapeutic, diagnosticagent, or composition to the animal, human, subject, cell, tissue,organ, or biological fluid. “Administration” and “treatment” can refer,e.g., to therapeutic, pharmacokinetic, diagnostic, research, andexperimental methods. Treatment of a cell encompasses contact of areagent to the cell, as well as contact of a reagent to a fluid, wherethe fluid is in contact with the cell. “Administration” and “treatment”also means in vitro and ex vivo treatments, e.g., of a cell, by areagent, diagnostic, binding composition, or by another cell.“Treatment,” as it applies to a human, veterinary, or research subject,refers to therapeutic treatment, prophylactic or preventative measures,to research and diagnostic applications. “Treatment” as it applies to ahuman, veterinary, or research subject, or cell, tissue, or organ,encompasses contact of an agent with animal subject, a cell, tissue,physiological compartment, or physiological fluid. “Treatment of a cell”also encompasses situations where the agent contacts PILR, e.g., in thefluid phase or colloidal phase, but also situations where the agonist orantagonist does not contact the cell or the receptor.

The term “subject” includes human and non-human animals. Non-humananimals include all vertebrates, e.g., mammals and non-mammals, such asnon-human primates, sheep, dog, cow, chickens, amphibians, and reptiles.Except when noted, the terms “patient” or “subject” are used hereininterchangeably.

In another aspect the present disclosure provides to an antibody orantibody fragment specific for M-CSF, comprising 6 CDRs of any of theantibodies in Table 1. In another aspect the present disclosure providesto an antibody or antibody fragment specific for M-CSF, comprising 6CDRs of any of the antibodies in Table 2.

In another aspect the present disclosure provides to an antibody orantibody fragment specific for M-CSF, comprising the variable heavychain and the variable light chain of any of the antibodies in Table 1.In another aspect the present disclosure provides to an antibody orantibody fragment specific for M-CSF, comprising the variable heavychain and the variable light chain of any of the antibodies in Table 2.

In another aspect the present disclosure provides an antibody orantibody fragment specific for M-CSF, encoded by any of the nucleic acidin Table 1. In another aspect the present disclosure provides anantibody or antibody fragment specific for M-CSF, encoded by any of thenucleic acid in Table 2. In another embodiment the present disclosureprovides a vector comprising a nucleic acid of Table 1. In anotherembodiment the present disclosure provides a vector comprising a nucleicacid of Table 2. In another embodiment the present disclosure providesan isolated host cell comprising a vector comprising a nucleic acid ofTable 1. In another embodiment the present disclosure provides anisolated host cell comprising a vector comprising a nucleic acid ofTable 2. In a further embodiment said isolated host cell is a mammaliancell.

EXAMPLES Example 1 Generation of Fab Fragments and Antibodies that areSpecific for M-CSF

For the selection of antibodies specifically binding to M-CSF acommercially available phage display library, the MorphoSys HuCALPLATINUM® library was used. Said antibody library is based on the HuCAL®concept (Knappik et al., (2000) J Mol Biol 296:57-86) and employs theCysDisplay® technology for displaying the Fab on the phage surface(WO2001/05950 to Lohning). However, any other available antibody librarywould be suitable to identify M-CSF antibodies.

To identify M-CSF-specific antibodies different panning strategies wereused. Each panning strategy comprised at least 3 individual rounds ofpanning against the receptor-binding domain of human M-CSF (rbdM-CSF),the sequence of which is shown in SEQ ID NO.: 5.

The isolated binders identified were maturated, engineered and/orgermlined in order to increase affinity and/or functionality of theinitial lead molecules. Several hundred binders were screened andrigorously tested for functionality.

A subset of 45 candidate molecules were produced in exploratory scaleand characterized in the following in vitro assays:

-   -   Binding to human and cynomolgus M-CSF in ELISA.    -   Binding to stably membrane M-CSF-transfected CHO cells and        endogenously membrane M-CSF-expressing MDA-MB 231 cells (source:        ATCC, order number: HTB-26).    -   Developability risk ranking    -   Functionality in the receptor inhibition assay (RIA) with human        M-CSF.    -   Functionality in the M-NFS-60 cell (source: ATCC, order number:        CTL-1838) viability assay with human M-CSF.

In total led eight preferred lead molecules were identified which arefurther descried herein below. The amino acid and the nucleic acidsequences of the variable regions and the CDRs of those eight bindersare shown in Table 1.

TABLE 1 ID # Seq. ID: Sequence [amino acid]/[nucleic acid] Caline HCDR1Seq. ID: 8 SNSAAWN HCDR2 Seq. ID: 9 RTYYRSKWKHEYAMSVKS HCDR3 Seq. ID: 10DRYYYSAFDY LCDR1 Seq. ID: 11 TGTSSDVGGYNSVS LCDR2 Seq. ID: 12 AVSNRPSLCDR3 Seq. ID: 13 ASYDERFTRV VH Seq. ID: 14QVQLQQSGPGLVKPSQTLSLTCAISGDSVSSNSAAWNWIRQSPSRGLEWLGRTYYRSKVVKHEYAMSVKSRITINPDTSKNQFSLQLNSVTPEDTAVYYCARDRYYYSAFDY WGQGTLVTVSS VL Seq. ID: 15QSALTQPASVSGSPGQSITISCTGTSSDVGGYNSVSWYQQHPGKAPKLMIYAVSNRPSGVSNRFSGSKSGNTASLTISGLQAEDEADYYCASYDERFTRVFGGGTKLTVL GQ VH (DNA) Seq. ID: 16caggtgcaattgcagcagagcggtccgggcctggtgaaaccgagccagaccctgagcctgacctgcgcgatttccggcgatagtgtgagtagcaatagcgctgcttggaactggattcgtcagagcccgagccgtggcctcgagtggctgggccgtacctactaccgtagcaaatggaaacatgaatatgccatgagcgtgaaaagccgcattaccattaacccggatacttcgaaaaaccagtttagcctgcaactgaacagcgtgaccccggaagatacggccgtgtattattgcgcgcgtgaccgttactactactctgctttcgattactggggccaaggcaccctggtgactgttag ctca VL (DNA)Seq. ID: 17 caaagcgcgctgacccagccggcgagcgtgagcggtagcccgggccagagcattaccattagctgcaccggcaccagcagcgatgtgggcggttacaattctgtttcttggtaccagcagcatccgggcaaggcgccgaaattgatgatttacgctgtttctaaccgtccgagcggcgtgagcaaccgttttagcggatccaaaagcggcaacaccgcgagcctgaccattagcggcctgcaagcggaagacgaagcggattattactgcgcttcttacgacgaacgtttcactcgtgtgtttggcggcggcacgaagttaaccgtcctaggtcag Camille HCDR1 Seq. ID: 18 TSSAAWN HCDR2Seq. ID: 19 RTYYRSKWKHEYAVSVKS HCDR3 Seq. ID: 20 DRYYYSAFDY LCDR1Seq. ID: 21 TGTSSDVGGYNSVS LCDR2 Seq. ID: 22 AVSNRPS LCDR3 Seq. ID: 23ASYDERFTRV VH Seq. ID: 24 QVQLQQSGPGLVKPSQTLSLTCAISGESVSTSSAAWNWIRQSPSRGLEWLGRTYYRSKWKHEYAVSVKSRITINPDTSKNQFSLQLNSVTPEDTAVYYCARDRYYYSAFDY WGQGTLVTVSS VL Seq. ID: 25QSALTQPASVSGSPGQSITISCTGTSSDVGGYNSVSWYQQHPGKAPKLLIYAVSNRPSGVSNRFSGSKSGNTASLTISGLQAEDEADYYCASYDERFTRVFGGGTKLTVLG Q VH (DNA) Seq. ID: 26caggtgcaattgcagcagagcggtccgggcctggtgaaaccgagccagaccctgagcctgacctgcgcgatttccggagagagtgtgagcactagtagtgctgcttggaactggattcgtcagagcccgagccgtggcctcgagtggctgggccgtacctactaccgtagcaaatggaaacatgaatatgccgtgagcgtgaaaagccgcattaccattaacccggatacttcgaaaaaccagtttagcctgcaactgaacagcgtgaccccggaagatacggccgtgtattattgcgcgcgtgaccgttactactactctgctttcgattactggggccaaggcaccctggtgactgttag ctca VL (DNA)Seq. ID: 27 caaagcgcgctgacccagccggcgagcgtgagcggtagcccgggccagagcattaccattagctgcaccggcaccagcagcgatgtgggcggttacaactctgtttcttggtaccagcagcatccgggcaaggcgccgaaactgctgatttacgctgtttctaaccgtccgagcggcgtgagcaaccgttttagcggatccaaaagcggcaacaccgcgagcctgaccattagcggcctgcaagcggaagacgaagcggattattactgcgcttcttacgacgaacgtttcactcgtgtgtttggcggcggcacgaagttaaccgtcctaggtcag Celine HCDR1 Seq. ID: 28 TSSAAWN HCDR2Seq. ID: 29 RTYYRSKWKHEYAVSVKS HCDR3 Seq. ID: 30 DRYYYSAFDY LCDR1Seq. ID: 31 TGTSSDVGGYNSVS LCDR2 Seq. ID: 32 AVSNRPS LCDR3 Seq. ID: 33ASYDERFTRV VH Seq. ID: 34 QVQLQQSGPGLVKPSQTLSLTCAISGDSVSTSSAAWNWIRQSPSRGLEWLGRTYYRSKWKHEYAVSVKSRITINPDTSKNQFSLQLNSVTPEDTAVYYCARDRYYYSAFDY WGQGTLVTVSS VL Seq. ID: 35QSALTQPASVSGSPGQSITISCTGTSSDVGGYNSVSWYQQHPGKAPKLIIYAVSNRPSGVSNRFSGSKSGNTASLTISGLQAEDEADYYCASYDERFTRVFGGGTKLTVLG Q VH (DNA) Seq. ID: 36caggtgcaattgcagcagagcggtccgggcctggtgaaaccgagccagaccctgagcctgacctgcgcgatttccggagacagcgtgagtaccagtagtgctgcttggaactggattcgtcagagcccgagccgtggcctcgagtggctgggccgtacctactaccgtagcaaatggaaacatgaatatgccgtgagcgtgaaaagccgcattaccattaacccggatacttcgaaaaaccagtttagcctgcaactgaacagcgtgaccccggaagatacggccgtgtattattgcgcgcgtgaccgttactactactctgctttcgattactggggccaaggcaccctggtgactgtta gctca VL (DNA)Seq. ID: 37 caaagcgcgctgacccagccggcgagcgtgagcggtagcccgggccagagcattaccattagctgcaccggcaccagcagcgatgtgggcggttacaactctgtttcttggtaccagcagcatccgggcaaggcgccgaaactgatcatctacgctgtttctaaccgtccgagcggcgtgagcaaccgttttagcggatccaaaagcggcaacaccgcgagcctgaccattagcggcctgcaagcggaagacgaagcggattattactgcgcttcttacgacgaacgtttcactcgtgtgtttggcggcggcacgaagttaaccgtcctaggtcag Madeleine HCDR1 Seq. ID: 38 SNSAAWN HCDR2Seq. ID: 39 RTYYRSKWKKEYAQSVKS HCDR3 Seq. ID: 40 DRYYYSAFDY LCDR1Seq. ID: 41 TGTSSDVGGYNSVS LCDR2 Seq. ID: 42 AVSNRPS LCDR3 Seq. ID: 43ASYDERFTRV VH Seq. ID: 44 QVQLQQSGPGLVKPSQTLSLTCAISGDSVSSNSAAWNWIRQSPSRGLEWLGRTYYRSKWKKEYAQSVKSRITINPDTSKNQFSLQLNSVTPEDTAVYYCARDRYYYSAFDY WGQGTLVTVSS VL Seq. ID: 45QSALTQPASVSGSPGQSITISCTGTSSDVGGYNSVSWYQQHPGKAPKLMIYAVSNRPSGVSNRFSGSKSGNTASLTISGLQAEDEADYYCASYDERFTRVFGGGTKLTVL GQ VH (DNA) Seq. ID: 46caggtgcaattgcagcagagcggtccgggcctggtgaaaccgagccagaccctgagcctgacctgcgcgatttccggagatagcgtgagcagtaactctgctgcttggaactggattcgtcagagcccgagccgtggcctcgagtggctgggccgtacctactaccgtagcaaatggaaaaaagaatatgcccagagcgtgaaaagccgcattaccattaacccggatacttcgaaaaaccagtttagcctgcaactgaacagcgtgaccccggaagatacggccgtgtattattgcgcgcgtgaccgttactactactctgctttcgattactggggccaaggcaccctggtgactgtta gctca VL (DNA)Seq. ID: 47 caaagcgcgctgacccagccggcgagcgtgagcggtagcccgggccagagcattaccattagctgcaccggcaccagcagcgatgtgggcggttacaattctgtttcttggtaccagcagcatccgggcaaggcgccgaaattgatgatttacgctgtttctaaccgtccgagcggcgtgagcaaccgttttagcggatccaaaagcggcaacaccgcgagcctgaccattagcggcctgcaagcggaagacgaagcggattattactgcgcttcttacgacgaacgtttcactcgtgtgtttggcggcggcacgaagttaaccgtcctaggtcag Maelle HCDR1 Seq. ID: 48 TSSAAWN HCDR2Seq. ID: 49 RTYYRSKWKKEYAQSVKS HCDR3 Seq. ID: 50 DRYYYSAFDY LCDR1Seq. ID: 51 TGTSSDVGGYNSVS LCDR2 Seq. ID: 52 AVSNRPS LCDR3 Seq. ID: 53ASYDERFTRV VH Seq. ID: 54 QVQLQQSGPGLVKPSQTLSLTCAISGESVSTSSAAWNWIRQSPSRGLEWLGRTYYRSKWKKEYAQSVKSRITINPDTSKNQFSLQLNSVTPEDTAVYYCARDRYYYSAFDY WGQGTLVTVSS VL Seq. ID: 55QSALTQPASVSGSPGQSITISCTGTSSDVGGYNSVSWYQQHPGKAPKLIIYAVSNRPSGVSNRFSGSKSGNTASLTISGLQAEDEADYYCASYDERFTRVFGGGTKLTVLG Q VH (DNA) Seq. ID: 56caggtgcaattgcagcagagcggtccgggcctcgtgaaaccgagccagaccctgagcctgacctgcgcgatttccggagaaagcgtgagtaccagcagtgctgcttggaactggattcgtcagagcccgagccgtggcctcgagtggctgggccgtacctactaccgtagcaaatggaaaaaagaatatgcccagagcgtgaaaagccgcattaccattaacccggatacttcgaaaaaccagtttagcctgcaactgaacagcgtgaccccggaagatacggccgtgtattattgcgcgcgtgaccgttactactactctgctttcgattactggggccaaggcaccctggtgactgtt agctca VL (DNA)Seq. ID: 57 caaagcgcgctgacccagccggcgagcgtgagcggtagcccgggccagagcattaccattagctgcaccggcaccagcagcgatgtgggcggttacaactctgtttcttggtaccagcagcatccgggcaaggcgccgaaactgatcatctacgctgtttctaaccgtccgagcggcgtgagcaaccgttttagcggatccaaaagcggcaacaccgcgagcctgaccattagcggcctgcaagcggaagacgaagcggattattactgcgcttcttacgacgaacgtttcactcgtgtgtttggcggcggcacgaagttaaccgtcctaggtcag Meriem HCDR1 Seq. ID: 58 TSSAAWN HCDR2Seq. ID: 59 RTYYRSKWKKEYAQSVKS HCDR3 Seq. ID: 60 DRYYYSAFDY LCDR1Seq. ID: 61 TGTSSDVGGYNSVS LCDR2 Seq. ID: 62 AVSNRPS LCDR3 Seq. ID: 63ASYDERFTRV VH Seq. ID: 64 QVQLQQSGPGLVKPSQTLSLTCAISGDSVSTSSAAWNWIRQSPSRGLEWLGRTYYRSKWKKEYAQSVKSRITINPDTSKNQFSLQLNSVTPEDTAVYYCARDRYYYSAFDY WGQGTLVTVSS VL Seq. ID: 65QSALTQPASVSGSPGQSITISCTGTSSDVGGYNSVSWYQQHPGKAPKLIIYAVSNRPSGVSNRFSGSKSGNTASLTISGLQAEDEADYYCASYDERFTRVFGGGTKLTVLG Q VH (DNA) Seq. ID: 66caggtgcaattgcagcagagcggtccgggcctggtgaaaccgagccagaccctgagcctgacctgcgcgatttccggcgacagcgtgagcaccagtagtgctgcttggaactggattcgtcagagcccgagccgtggcctcgagtggctgggccgtacctactaccgtagcaaatggaaaaaagaatatgcccagagcgtgaaaagccgcattaccattaacccggatacttcgaaaaaccagtttagcctgcaactgaacagcgtgaccccggaagatacggccgtgtattattgcgcgcgtgaccgttactactactctgctttcgattactggggccaaggcaccctggtgactgtt agctca VL (DNA)Seq. ID: 67 caaagcgcgctgacccagccggcgagcgtgagcggtagcccgggccagagcattaccattagctgcaccggcaccagcagcgatgtgggcggttacaactctgtttcttggtaccagcagcatccgggcaaggcgccgaaactgatcatctacgctgtttctaaccgtccgagcggcgtgagcaaccgttttagcggatccaaaagcggcaacaccgcgagcctgaccattagcggcctgcaagcggaagacgaagcggattattactgcgcttcttacgacgaacgtttcactcgtgtgtttggcggcggcacgaagttaaccgtcctaggtcag Satine HCDR1 Seq. ID: 68 IYAMS HCDR2Seq. ID: 69 RIKSNADGGTTEYAAPVKG HCDR3 Seq. ID: 70 MRYYSDLYFDP LCDR1Seq. ID: 71 SGDKLGQKYVS LCDR2 Seq. ID: 72 QDRKRPS LCDR3 Seq. ID: 73QTWTHLQWV VH Seq. ID: 74 EVQLVESGGGLVKPGGSLRLSCAASGFTFSIYAMSWVRQAPGKGLEWVGRIKSNADGGTTEYAAPVKGRFTISRDDSKNTLYLQMNSLKTEDTAVYYCARMRYYSDLYFDP WGQGTLVTVSS VL Seq. ID: 75SYELTQPPSVSVSPGQTASITCSGDKLGQKYVSWYQQKPGQSPVLVISQDRKRPSGIPERFSGSNSGNTATLTISGTQAEDEADYYCQTWTHLQWVFGGGTKLTVLGQ VH (DNA) Seq. ID: 76gaagtgcagctggtggaaagcggcggtggcctggtgaaaccaggcggcagcctgcgcctgagctgcgccgccagcggcttcacctttagcatctacgctatgagctgggtgcgccaggccccgggcaaaggtctggaatgggtgggccgtatcaaatctaacgctgacggtggtactactgaatatgccgccccagtgaaaggccgctttaccattagccgcgatgatagcaaaaacaccctgtatctgcaaatgaacagcctgaaaaccgaagatacggccgtgtattattgcgcgcgtatgcgttactactctgacctgtacttcgatccgtggggtcaaggcaccctggtgactgtct cgagc VL (DNA)Seq. ID: 77 agctatgaactgacccagccgccgagcgttagcgttagcccaggccagaccgccagcattacctgtagcggcgacaaactggggcaaaaatacgtgtcctggtatcagcagaaaccgggccagagcccggtgctggttatcagtcaggatcgtaaacgcccgagcggcattccagaacgctttagcggcagcaacagcggcaacaccgccaccctgaccattagcggcacccaggccgaagacgaagccgattattactgccagacttggacccacctgcaatgggtgtttggcggcggtaccaagctgaccgtgctgggccag Servane HCDR1 Seq. ID: 78 TYAIS HCDR2 Seq. ID: 79FIKSKHNSGTTEYAAPVKG HCDR3 Seq. ID: 80 MRYYSDLYFDP LCDR1 Seq. ID: 81SGDKLGQKYVS LCDR2 Seq. ID: 82 QDRKRPS LCDR3 Seq. ID: 83 QTWTHLQWV VHSeq. ID: 84 EVQLVESGGGLVKPGGSLRLSCAASGFTFSTYAISWVRQAPGKGLEWVGFIKSKHNSGTTEYAAPVKGRFTISRDDSKNTLYLQMNSLKTEDTAVYYCARMRYYSDLYFDP WGQGTLVTVSS VL Seq. ID: 85SYELTQPPSVSVSPGQTASITCSGDKLGQKYVSWYQQKPGQSPVLVISQDRKRPSGIPERFSGSNSGNTATLTISGTQAEDEADYYCQTWTHLQWVFGGGTKLTVLGQ VH (DNA) Seq. ID: 86gaagtgcaattggtggaaagcggcggtggcctggtgaaaccaggcggcagcctgcgcctgagctgcgccgcctccggattcaccttttctacttacgctatctcttgggtgcgccaggccccgggcaaaggtctcgagtgggtgggcttcatcaaatctaaacataactctggtactactgaatatgccgccccagtgaaaggccgctttaccattagccgcgatgattcgaaaaacaccctgtatctgcaaatgaacagcctgaaaaccgaagatacggccgtgtattattgcgcgcgtatgcgttactactctgacctgtacttcgatccgtggggtcaaggcaccctggtgactgtctcgagc VL (DNA)Seq. ID: 87 agctatgaactgacccagccgccgagcgttagcgttagcccaggccagaccgccagcattacctgtagcggcgacaaactggggcaaaaatacgtgtcctggtatcagcagaaaccgggccagagcccggtgctggttatcagtcaggatcgtaaacgcccgagcggcattccagaacgctttagcggcagcaacagcggcaacaccgccaccctgaccattagcggcacccaggccgaagacgaagccgattattactgccagacttggacccacctgcaatgggtgtttggcggcggtaccaagctgaccgtgctgggccag

Antibodies Caline, Camille and Celine are derivatives of parentalantibody Blanche. Antibodies Madeleine, MaeIle and Meriem arederivatives of parental antibody Laurine. Antibodies Satine and Servaneare derivatives of parental antibody Romaine. The amino acid and thenucleic acid sequences of the variable regions and the CDRs of theparental antibodies are shown in Table 2.

TABLE 2  ID# Seq. ID: Sequence [amino acid]/[nucleic acid] Blanche HCDR1Seq. ID: 88 SNSAAWN HCDR2 Seq. ID: 89 RTYYRSKWKHEYAMSVKS HCDR3Seq. ID: 90 DRYYYSAFDY LCDR1 Seq. ID: 91 TGTSSDVGGYNSVS LCDR2Seq. ID: 92 AVSNRPS LCDR3 Seq. ID: 93 ASYDERFTRV VH Seq. ID: 94QVQLQQSGPGLVKPSQTLSLTCAISGDSVSSNSAAWNWIRQSPSRGLEWLGRTYYRSKWKHEYAMSVKSRITINPDTSKNQFSLQLNSVTPEDTAVYYCARDRYYYSAFDY WGQGTLVTVSS VL Seq. ID: 95DIALTQPASVSGSPGQSITISCTGTSSDVGGYNSVSWYQQHPGKAPKLMIYAVSNRPSGVSNRFSGSKSGNTASLTISGLQAEDEADYYCASYDERFTRVFGGGTKLTVLGQ VH  Seq. ID: 96caggtgcaattgcagcagagcggtccgggcctggtgaaaccgagccaga (DNA)ccctgagcctgacctgcgcgatttccggagatagcgtgagcagtaactctgctgcttggaactggattcgtcagagcccgagccgtggcctcgagtggctgggccgtacctactaccgtagcaaatggaaacatgaatatgccatgagcgtgaaaagccgcattaccattaacccggatacttcgaaaaaccagtttagcctgcaactgaacagcgtgaccccggaagatacggccgtgtattattgcgcgcgtgaccgttactactactctgctttcgattactggggccaaggcaccctggtgactgttag ctca VL Seq. ID: 97 gatatcgcgctgacccagccggcgagcgtgagcggtagcccgggccaga (DNA)gcattaccattagctgcaccggcaccagcagcgatgtgggcggttacaactctgtgtcttggtaccagcagcatccgggcaaggcgccgaaactgatgatctacgctgtttctaaccgtccgagcggcgtgagcaaccgttttagcggatccaaaagcggcaacaccgcgagcctgaccattagcggcctgcaagcggaagacgaagcggattattactgcgcttcttacgacgaacgtttcactcgtgtgtttggcggcggcacgaagttaaccgtcctaggtcag Laurine HCDR1 Seq. ID: 98 SNSAAWN HCDR2Seq. ID: 99 RTYYRSKWKKEYAQSVKS HCDR3 Seq. ID: 100 DRYYYSAFDY LCDR1Seq. ID: 101 TGTSSDVGGYNSVS LCDR2 Seq. ID: 102 AVSNRPS LCDR3Seq. ID: 103 ASYDERFTRV VH Seq. ID: 104QVQLQQSGPGLVKPSQTLSLTCAISGDSVSSNSAAWNWIRQSPSRGLEWLGRTYYRSKWKKEYAQSVKSRITINPDTSKNQFSLQLNSVTPEDTAVYYCARDRYYYSAFDY WGQGTLVTVSS VL Seq. ID: 105DIALTQPASVSGSPGQSITISCTGTSSDVGGYNSVSWYQQHPGKAPKLMIYAVSNRPSGVSNRFSGSKSGNTASLTISGLQAEDEADVYYCASYDERFTRVFGGGTKLTVLGQ VH  Seq. ID: 106caggtgcaattgcagcagagcggtccgggcctggtgaaaccgagccaga (DNA)ccctgagcctgacctgcgcgatttccggagatagcgtgagcagtaactctgctgcttggaactggattcgtcagagcccgagccgtggcctcgagtggctgggccgtacctactaccgtagcaaatggaaaaaagaatatgcccagagcgtgaaaagccgcattaccattaacccggatacttcgaaaaaccagtttagcctgcaactgaacagcgtgaccccggaagatacggccgtgtattattgcgcgcgtgaccgttactactactctgctttcgattactggggccaaggcaccctggtgactgtta gctca VL Seq. ID: 107 Gatatcgcgctgacccagccggcgagcgtgagcggtagcccgggccag (DNA)agcattaccattagctgcaccggcaccagcagcgatgtgggcggttacaactctgtgtcttggtaccagcagcatccgggcaaggcgccgaaactgatgatctacgctgtttctaaccgtccgagcggcgtgagcaaccgttttagcggatccaaaagcggcaacaccgcgagcctgaccattagcggcctgcaagcggaagacgaagcggattattactgcgcttcttacgacgaacgtttcactcgtgtgtttggcggcggcacgaagttaaccgtcctaggtcag Romaine HCDR1 Seq. ID: 108 IYAMS HCDR2Seq. ID: 109 RIKSNADGGTTEYAAPVKG HCDR3 Seq. ID: 110 MRYSDLYFDP LCDR1Seq. ID: 111 SGDAIGSKYVH LCDR2 Seq. ID: 112 KDNKRPS LCDR3 Seq. ID: 113QTATVSSYWWV VH Seq. ID: 114 EVQLVESGGGLVKPGGSLRLSCAASGFTFSIYAMSWVRQAPGKGLEWVGRIKSNADGGTTEYAAPVKGRFTISRDDSKTLYLQMNSLKTEDTAVYYCARMRYYSDLYFDP WGQGTLVTVSS VL Seq. ID: 115DIELTQPPSVSVSPGQTASITCSGDAIGSKVHWYQQKPGQAPVLVISKDNKRPSGIPERFSGSNSGNTATLTISGTQAEDDEADYYCQTATVSSYWWVFGGGTKLTVLGQ VH  Seq. ID: 116caggtgcaattggtggaaagcggcggtggcctggtgaaaccaggcggca (DNA)gcctgcgcctgagctgcgccgcctccggattcaccttttctatctacgctatgtcttgggtgcgccaggccccgggcaaaggtctcgagtgggtgggccgtatcaaatctaacgctgacggtggtactactgaatatgccgccccagtgaaaggccgctttaccattagccgcgatgattcgaaaaacaccctgtatctgcaaatgaacagcctgaaaaccgaagatacggccgtgtattattgcgcgcgtatgcgttagctctctgacctgtacttcgatccgtggggccaaggcaccctggtgactgttagctca VL  Seq. ID: 117gatatcgaactgacccagccgccgagcgtgagcgtgagcccgggccaga (DNA)ccgcgagcattacctgtagcggcgatgctatcggttctaaatacgttcattggtaccagcagaaaccgggccaggcgccggtgctggtgatctctaaagacaacaaacgtccgagcggcatcccggaacgttttagcggatccaacagcggcaacaccgcgaccctgaccattagcggcacccaggcggaagacgaagcggattattactgccagactgctactgtttcttcttactggtgggtgtttggcggcggcacgaagttaaccgtcctaggtcag

Example 2 Characterisation and Benchmarkinq of the M-CSF SpecificAntibodies

The eight preferred M-CSF specific antibodies were characterized indepth as described herein below. The antibodies were compared to therespective parental antibodies and to two prior art antibodies whichwere generated for clinical development. The amino acid sequence ofHeRX1-10G1 (Novartis) is for example disclosed in WO 2005/068503 andalso shown in Table 3. The amino acid sequence of 8.10.3F (Pfizer) isfor example disclosed in WO 2005/030124 and also shown in Table 3.HeRX1-10G1 and 8.10.3F were synthesized using conventional molecularbiology techniques.

TABLE 3  Sequence [amino acid]/ ID# Seq. ID: [nucleic acid] HeRX1- HCDR1Seq. ID: 118 SDYAWN 10G1 HCDR2 Seq. ID: 119 YISYSGSTSYNPSLKS HCDR3Seq. ID: 120 FDYAHAMDY LCDR1 Seq. ID: 121 QASQSIGTSIH LCDR2 Seq. ID: 122YASESIS LCDR3 Seq. ID: 123 QQINSWPT VH Seq. ID: 124QVQLQESGPGLVKPSQTLSLTCTVS DYSITSDYAWNWIRQFPGKGLEWMGYISYSGSTSYNPSLKSRITISRDTS KNQFSLQLNSVTAADTAVYYCASFD YAHAMDYWGQGTTVTVSSVL Seq. ID: 125 DIVLTQSPAFLSVTPGEKVTFTCQA SQSIGTSIHWYQQKTDQAPKLLIKYASESISGIPSRFSGSGSGTDFTLTI SSVEAEDAADYYCQQINSWPTTFGG GTKLEIKRT VH Seq. ID: 126 caggtgcaattgcaggaaagcggcc (DNA) ctggcctggtcaagcctagccagaccctgagcctgacctgcaccgtgtcc gactacagcatcaccagcgactacgcctggaactggatccggcagttccc cggcaagggcctggaatggatgggctacatcagctacagcggcagcacca gctacaaccccagcctgaagtcccggatcaccatcagccgggacaccagc aagaaccagtttagcctccagctga a

The antibodies of the present disclosure may be used in any format, i.e.as full lengths immunoglobulins or as antibody fragments as describedherein. The full length antibodies may be used in any immunoglobulinisotype or class. With a few exceptions, the antibodies of the presentinvention were tested in IgG1 format and in a silenced IgG1 formatharboring a D265A mutation in the Fc region. Antibody 8.10.3F was alsotested in IgG2 format.

Example 3 Specificity for M-CSF as Determined in an ELISA Assay

Specificity for human M-CSF and cynomolgus M-CSF was tested in an ELISAassay. BSA was used as a negative control substrate.

Maxisorp™ 384 well plates were coated with human rbdM-CSF, humansgM-CSF, cyno sgM-CSF or mouse sgM-CSF at a concentration of 2 pg/ml inPBS. After blocking of plates with 5% skim milk powder in PBS,Fab-containing E. coli lysates, IgG-containing cell culture supernatantsor purified IgG or Fab proteins were added. Binding of Fabs or IgGs wasdetected by F(ab)₂ specific goat anti-human IgG conjugated to alkalinephosphatase (Dianova Cat# 109-055-097; diluted 1:5000) using Attophosfluorescence substrate (Roche, #11681982001). Fluorescence emission at535 nm was recorded with excitation at 430 nm.

In an alternative experimental set-up, Maxisorp™ 384 well plates werecoated with Fd fragment specific sheep anti-human IgG (The Binding Site,#PC075) diluted 1:1000 in PBS. After blocking with 5% skim milk powderin PBS, Fab-containing E. coli lysates were added. Subsequently thecaptured HuCAL®-Fab fragments were allowed to bind to 0.5 pg/mlbiotinylated M-CSF (human sgM-CSF, human rbdM-CSF, or mouse sgM-CSF)which was detected by incubation with streptavidin conjugated toalkaline phosphatase followed by addition of AttoPhos fluorescencesubstrate (Roche, #11681982001). Fluorescence emission at 535 nm wasrecorded with excitation at 430 nm.

All antibodies shown in Tables 1, 2 and 3 strongly bound to human M-CSFand cynomolgus M-CSF (>35,000 units), whereas none of the antibodiesbound to BSA (<1,000 units). All antibodies are therefore highlyspecific for M-CSF.

Example 4 Specificity for M-CSF as Determined in a FACS Experiment;EC50s

A FACS study was performed in order to test if the antibodies of thepresent disclosure also binds to M-CSF expressed on cells. Two celllines were used for this purpose: CHO cells which were stablytransfected with M-CSF, and the cell line MDA-MB-231 which endogenouslyexpresses M-CSF. Apparent K_(D) values (EC₅₀) were determined with bothcell lines. The results are shown in Table 4. All values are in [nM].

TABLE 4 EC₅₀ values of antibodies as determined in a FACS assay (nM)MDA-MB 231 Antibody# Format CHO cells (n = 3) cells (n = 2) BlancheIgG1_D265A 7.5 10 Caline IgG1_D265A 9.8 14 Camille IgG1_D265A 6.1 14Celine IgG1_D265A 9.7 13 Laurine IgG1_D265A 11.2 9 Madeleine IgG1_D265A6.4 10 Maelle IgG1_D265A 10.2 8 Meriem IgG1_D265A 12.3 10 RomaineIgG1_D265A 16.4 19 Satine IgG1_D265A 11.3 26 Servane IgG1_D265A 21.3n.d. HeRX1-10G1 IgG1 12.6 27 HeRX1-10G1 IgG1_D265A 8.9 23 8.10.3F IgG223.2 310 8.10.3F IgG1_D265A 8.9 16

All antibodies of the present invention show EC₅₀ values which are atleast as good as those of the prior art antibodies HeRX1-10G1 and8.10.3F, and many antibodies show EC₅₀ values which are better (lower)that those of the prior art antibodies.

Example 5 Inhibition of Receptor Binding

In this experiment the ability of the antibodies to block binding ofhuman or cynomolgus M-CSF to recombinant human M-CSF receptor (providedas Fc fusion protein) was assessed. The following recombinantligand/receptor-combinations were used:

TABLE 5 Ligand/receptor combinations used in Receptor inhibition assaysHuman M-CSF Ligand Recombinant human sgM-CSF Receptor Recombinant humanCSF1-R-Fc (R&D Systems Cat. Nr. #329-MR) Mouse M-CSF Ligand Recombinantmurine sgM-CSF Receptor Recombinant murine M-CSF receptor CSF-1R-Fc (R&DSystems, Cat. Nr.#3818-MR) Cyno M-CSF Ligand Recombinant cynomolgusmonkey sgM-CSF Receptor Recombinant human CSF1-R-Fc (R&D Systems Cat.Nr. #329-MR)

M-CSF at a final concentration of 12.5 pM (0.66 ng/ml) was preincubatedwith different concentrations of anti-M-CSF antibody (0.1 pM-100 nM; alldilutions in ECL-buffer) for 1 h at room temperature. Complexes werethen transferred to 384 well MSD plates coated with 2 μg/ml of thecorresponding receptor. Plates were then washed and incubated with thestreptavidin/ECL conjugate for 2 h with shaking at room temperature. 35μl MSD read buffer T with surfactant was then added per well andsubsequently measured using MSD Sector Imager 6000.

IC50 values were calculated for both, human M-CSF and cynomolgus M-CSF.The results are shown in Table 6. All values are in [pM]. n=4, exceptfor HeRX1-10G1 in IgG1 format and 8.10.3F in IgG2 format.

TABLE 6 IC₅₀ values of antibodies as determined in a receptor bindinginhibition assay (pM) Human Cynomolgus Antibody# Format M-CSF M-CSFBlanche IgG1_D265A 6.2 6.6 Caline IgG1_D265A 6.1 6.3 Camille IgG1_D265A4.4 5.9 Celine IgG1_D265A 4.7 6.9 Laurine IgG1_D265A 4.9 4.3 MadeleineIgG1_D265A 5.6 5.6 Maelle IgG1_D265A 5.3 6.4 Meriem IgG1_D265A 7.0 7.3Romaine IgG1_D265A 9.1 9.1 Satine IgG1_D265A 15.1 13.5 ServaneIgG1_D265A 31.3 11.8 HeRX1-10G1 IgG1 26.5 27.6 HeRX1-10G1 IgG1_D265A28.0 18.0 8.10.3F IgG2 31.4 20.7 8.10.3F IgG1_D265A 19.2 14.6

All candidates blocked the binding of M-CSF to its receptor better thanthe prior art antibodies HeRX1-10G1 and 8.10.3F. This is particularlytrue for the antibodies which are derived from the parental antibodiesBlanche and Laurine, all of which shown IC50 values of below 10 pM.

Example 6 Inhibition of Proliferation Induced by Recombinant M-CSF

The ability of the antibodies of the present disclosure to block thebioactivity of recombinant M-CSF was assessed in a cell viability assayusing the M-CSF-dependent murine myeloid cell line M-NFS-60.Proliferation of this cell line can be induced by human, cynomolgus,rat, and mouse M-CSF. To characterize the anti-M-CSF antibodies,proliferation was induced either by recombinant soluble M-CSF, nativesoluble M-CSF, or by transfectants expressing cell-surface M-CSF. Thefollowing components were tested (Examples 5-7).

TABLE 7 Origin of the M-CSF tested in the Proliferation InhibitionAssays (Examples 5-7) Recombinant M-CSF Recombinant human sgM-CSF [finalconc. in assay: 9.5 pM] Recombinant murine sgM-CSF [final conc. inassay: 9.5 pM] Recombinant cynomolgus monkey sgM-CSF [final conc. inassay: 9.5 pM] Recombinant rat M-CSF (PromoKine, Cat #E60442) [finalconc. in assay: 9.5 pM] Secreted M-CSF Conditioned cell culture mediumfrom MDA-MB-231 cells collected after 3 days of incubation [final conc.in assay: 50%] Cell-bound M-CSF CHO cells stably transfected with humanM-CSF, fixed with 2.5% glutaraldehyde for 30 min at room temperatureSerum Human serum (Sigma H45522; heat inactivated 30 min at 56° C.)[final conc. in assay: 50%]

M-NFS-60 cells were cultured (96 well plates) in RPMI 1640 containingstabilized glutamine (Pan Biotech, PAN-PO4-18500) and supplemented with10% FCS, 1mM Na-Pyruvate, 10 mM HEPES and in the presence of 9.5 pM (0.5ng/ml) recombinant human or cynomolgus M-CSF and increasingconcentration of antibodies. Viability of the cells was determined after3 days of culture with CellTiter-Glo® reagent (Promega, Cat# G-7571).Luminescence was measured with a standard luminometer to determine cellviability (relative ATP content). IC₅₀ values were determined usingGraphPad Prism software. The results are shown in Table 8. All valuesare in [pM].

TABLE 8 IC₅₀ values of antibodies as determined in an assay measuringthe inhibition of proliferation induced by recombinant M-CSF [pM] HumanM- Cynomolgus Antibody# Format CSF (n = 2) M-CSF (n = 2) BlancheIgG1_D265A 2.9 3.3 Caline IgG1_D265A 3.1 4.3 Camille IgG1_D265A 2.3 2.6Celine IgG1_D265A 2.7 3.0 Laurine IgG1_D265A 2.6 2.8 MadeleineIgG1_D265A 3.0 2.8 Maelle IgG1_D265A 2.7 2.3 Meriem IgG1_D265A 3.1 2.8Romaine IgG1_D265A 8.4 8.1 Satine IgG1_D265A 5.3 5.4 Servane IgG1_D265A11.8 13.4 HeRX1- IgG1 3.6 4.1 10G1 HeRX1- IgG1_D265A 3.0 3.5 10G18.10.3F IgG2 71.1 84.6 8.10.3F IgG1_D265A 14.9 16.5

All antibodies tested blocked the binding of M-CSF to its receptor. Inparticular, the antibodies which are derived from the parentalantibodies Blanche and Laurine are more potent than the prior artantibodies, in particular more potent than 8.10.3F.

Example 7 Inhibition of Proliferation Induced by Native M-CSF

The ability of the antibodies of the present disclosure to block thebioactivity of native human M-CSF was assessed in an M-NFS-60 cellproliferation assay. Here, proliferation was induced either by humanserum or MDA-MB-231 conditioned medium. Antibodies were pre-incubatedfor 30min in serum in a 96 well-plate before 1000 M-NFS-60 cells wereadded. The final serum concentration was 50% and the cell culture mediumwas not supplemented with FCS. Cell viability was determined asdescribed above after 3 days. Immunoglobulins were titrated and IC50swere calculated. The results are shown in Table 9. All values are in[pM].

TABLE 9 IC₅₀ values of antibodies as determined in an assay mesruing theinhibition of proliferation by recombinant M-CSF (pM) MDA-MB-231conditioned Antibody# Format Human serum medium Blanche IgG1_D265A 18.3120.5 Caline IgG1_D265A 17.7 106.9 Camille IgG1_D265A 17.7 98.5 CelineIgG1_D265A 23.8 72.4 Laurine IgG1_D265A 15.6 95.0 Madeleine IgG1_D265A20.0 75.4 Maelle IgG1_D265A 16.0 98.9 Meriem IgG1_D265A 15.1 76.9Romaine IgG1_D265A 25.2 83.3 Satine IgG1_D265A 31.8 70.8 ServaneIgG1_D265A 93.2 107.0 HeRX1-10G1 IgG1 15.4 90.3 HeRX1-10G1 IgG1_D265A12.4 59.1 8.10.3F IgG2 349.7 739.0 8.10.3F IgG1_D265A 201.4 79.5

All antibodies tested efficiently blocked the bioactivity of M-CSFpresent in MDA-MB-231-conditioned medium. Prior art antibody 8.10.3F wasless potent than the other antibodies tested. Similarly, all antibodiesinhibited the bioactivity of M-CSF present in human serum. Again, priorart antibody 8.10.3F was less potent than the other immunoglobulinstested.

Example 8 Inhibition of Proliferation Induced by Cell Surface M-CSF

The ability of the antibodies of the present disclosure to block thebioactivity of membrane-bound M-CSF isoforms was assessed in an assay inwhich proliferation of M-NFS-60 cells was induced by CHO cells stablyexpressing human cell-surface M-CSF (CHO_hM-CSF cells). 2000 CHO_hM-CSFcells per well were cultured overnight at 37° C. in cell-culture 96 wellplates, washed twice with PBS and fixed with 100 pl 2%glutaraldehyde/PBS per well for 30 min at 37° C. After washing with PBS,fixed cells were incubated with anti-M-CSF antibodies (final IgGconcentrations 0.05 nM, 0.5 nM, 5 nM, 50 nM) for 30 min at 37° C.Subsequently, 5000 M-NFS-60 cells per well were added and cultivated for72 h at 37° C. before cell viability was determined as described above.Results are shown in FIG. 1.

All M-CSF-specific immunoglobulins efficiently inhibited proliferationinduced by CHO cells expressing M-CSF. The degree of inhibition increasewith an increasing concentration of IgG. Inhibition was almost 100% atthe highest IgG concentration tested (50 nM). MOR3207, an antibody withspecificity to lysozyme, did not inhibit proliferation.

Example 9 Affinity Determination

The monovalent affinity of the antibodies of the present disclosure wasdetermined by soluble equilibrium titration (Haenel et al. (2005) AnalBiochem 339, 182-4). The antibodies were purified in Fab format andK_(D) to human and cynomolgus M-CSF was determined. The results areshown in Table 10. All values are in [pM].

TABLE 10 Monovalent affinities (K_(D) values) of antibodies asdetermined by SET Human M- Cynomolgus M- Antibody# CSF CSF Blanche 96130 Caline 14 16 Camille 18 25 Celine n.d. n.d. Laurine 96 150 Madeleine28 30 Maelle 13 27 Meriem 11 13 Romaine 13 7 Satine <2 n.d. Servane n.d.n.d. HeRX1-10G1 >1,000 n.d. 8.10.3F 38 n.d.

As shown in Table 10 all Fabs tested bound to human and cynomolgusM-CSF. Intriguingly, most antibodies demonstrated K_(D) values of 30 pMor lower, i.e. affinities which are higher than those of prior artantibodies HeRX1-10G1 and 8.10.3F. There was no significant differenceobserved in affinity between human and cynomolgus M-CSF.

Example 10 Specificity of the Antibodies

The specificity of binding of the antibodies of the present inventionwas exemplary tested with antibody Camille as described in Frese et al.(2013) MAbs, February 14; 5(2) [Epub ahead of print]. For thisspecificity profiling test the different proteins and controls werecoated on two 384-well MSD plates with a concentration of 1 μg/ml at 4 °C. over night. Plates were blocked with BSA and washed three times withPBS with 0.05% (v/v) Tween 20. Antibody samples were diluted to 100 nMand 10 nM in assay buffer (PBS with 0.5% (w/v) BSA, 0.05% (v/v) Tween20). As controls, an unspecific antibody (MOR03207; anti-lysozym) andassay buffer were used. Samples and controls were incubated for threehours at room temperature. The plates were washed three times and 30 pldetection antibody (ECL-labeled anti-human Fab) were added per well andincubated for 1 h. After washing, MSD Read Buffer T with surfactant wasadded and electrochemiluminescence signals were detected using a SectorImager 6000 (Meso Scale Discovery, Gaithersburg, Md., USA).

For evaluation, signals of the antibody sample on a certain protein werenormalized to the reference antibody MOR03027. Results are shown inTable 11.

TABLE 11 Specificity of antibody Camille Antibody Camille Target antigen100 nM 10 nM Blank 1 1 Protein A (Staphylococcus aureus) 1 1 Serumalbumin (human) 1 1 Fibrinogen (bovine) 1 1 Haemoglobin (human) 1 1Transferrin (bovine) 1 1 Antitrypsin (human) 1 1 Lysozyme (chicken) 0 0Cell surface receptor 1 (human) 1 1 Cytokine 1 (human) 1 1 Cytokine 2(human) 2 1 Cell surface receptor 2 (human) 1 1 M-CSF (human) 24 244Cell surface receptor 3 (human) 1 1 Blank 2 1 Pepsinogen (pork) 1 1Aminogylcosidase (Aspergillus 1 1 niger) Trypsin inhibitor (Soybean) 1 1Cytochrome c (cow) 1 1 Myoglobin (horse) 1 1 Lectin (Lens culinaris) 1 1Ovalbumin (chicken) 1 1 Trypsinogen (cow) 1 1 Milk powder (cow) 1 1RNase B (cow) 1 1 RNase A (cow) 1 1 Anti-human Fab (Dianova, # 109- 1 1005-097) Anti-human Fc (Dianova, #109- 1 1 005-098) blank 1 1

Exemplary antibody Camille was highly specific for M-CSF and did notshow unspecific binding to any of the unrelated proteins tested in thisassay.

Example 11 Comparison of Exemplary Antibody Camille with the Prior ArtAntibodies

In the following Table the key features of antibody Camille are comparedto the prior art antibodies HeRX1.10G1 and 8.10.3F.

TABLE 12 Comaprison of antibody Camille to the antibodies in the priorart Criterion Camille HeRX1.10G1 8.10.F3 Binding Human M-CSF 18pM >1,000 pM    38 pM Cynomolgus M-CSF 25 pM n.d. n.d. IL-34, GM-CSF,SCF no no no Membrane-bound M-CSF yes yes yes Functionality ReceptorHuman M-  4 pM 27 pM 31 pM binding CSF assay (IC50) Cynomolgus  6 pM 28pM 21 pM M-CSF Cell viability Human M-  2 pM  4 pM 71 pM assay (IC50)CSF Cynomolgus  3 pM  4 pM 85 pM M-CSF Membrane- yes yes yes bound M-CSF MDA-MB- 99 pM 90 pM 739 pM  231 Human 18 pM 15 pM 350 pM  serum M-CSF

In summary, antibody Camille, as well as the other antibodies of thepresent disclosure, shows a binding affinity which is superior to allthe prior art antibodies. This is also reflected in the functionalassays, in which Camille performs at least as good as, but in mostassays better than, the prior art antibodies HeRX1.10G1 and 8.10.F3.

Example 12 Efficacy of the Antibodies in a Clinical Trial

A multi-center, randomized, double-blinded, placebo-controlled study toevaluate the safety, preliminary clinical activity and immunogenicity ofmultiple doses of the antibodies of the present disclosure administeredintravenously to patients with active rheumatoid arthritis will beconducted.

Primary outcome measures are the adverse event rate and the safetyprofile. Secondary outcome measures included DAS28 scores, ACR scoresand EULAR28 response criteria.

The clinical trial comprises three treatment arms. In each treatment armpatients receive either placebo or the antibodies of the presentdisclosure (0.3 mg/kg body weight for treatment arm 1, 1.0 mg/kg bodyweight for treatment arm 2 and 1.5 mg/kg body weight for treatment arm3). Antibodies and placebo are administered intravenously, weekly with 4doses in total.

Prior to administration the disease activity of all patients is measuredaccording to accepted guidelines by calculating the DAS28 score, a28-joint Disease Activity Score (see e.g. Ann Rheum Dis (2009) 68,954-60). DAS28 score is a validated and commonly used tool to quantifythe disease status of RA patients. The average DAS28 score is comparablefor all treatment arms.

The antibodies of the present disclosure show a favorable safety profileamong all doses tested and the treatment is safe.

4 weeks and 8 weeks after the first administration of the antibodies orplacebo the DAS28 scores of all patients is determined. A decrease inDAS28 scores correlates to diminished disease severity.

All patients treated with the antibodies of the present disclosure showa decrease in DAS28 scores, indicating less severity of the disease ofeffectiveness of the treatment. In contrast, patients treated withplacebo showed do not show any benefit from treatment.

As another measure of efficacy the ACR20 criteria were used. ACRcriteria measure improvement in tender or swollen joint counts andimprovement in certain other parameters. The procedure to measure ACRscores is highly standardized. The present clinical trial applied therespective guidelines of the EMEA.

In line with the results of the DAS28 scores, also the ACR scores show astrong clinical improvement of patients' condition upon treatment withthe antibodies of the present disclosure. The improvement after 4 weeksis highly significant.

1. An isolated antibody or antibody fragment, which specifically bindsto M-CSF and wherein said isolated antibody or antibody fragment is ableto inhibit the binding of M-CSF to the M-CSF receptor with an IC50 of 10pM or less in a receptor binding inhibition assay comprising M-CSF at afinal concentration of 12.5 pM.
 2. An isolated antibody or antibodyfragment according to claim 1, wherein said antibody or antibodyfragment comprises (a) the HCDR1 region of SEQ ID NO.: 8, the HCDR2region of SEQ ID NO.: 9, the HCDR3 region of SEQ ID NO.: 10, the LCDR1region of SEQ ID NO.: 11, the LCDR2 region of SEQ ID NO.: 12 and theLCDR3 region of SEQ ID NO.: 13, (b) the HCDR1 region of SEQ ID NO.: 18,the HCDR2 region of SEQ ID NO.: 19, the HCDR3 region of SEQ ID NO.: 20,the LCDR1 region of SEQ ID NO.: 21, the LCDR2 region of SEQ ID NO.: 22and the LCDR3 region of SEQ ID NO.: 23, (c) the HCDR1 region of SEQ IDNO.: 28, the HCDR2 region of SEQ ID NO.: 29, the HCDR3 region of SEQ IDNO.: 30, the LCDR1 region of SEQ ID NO.: 31, the LCDR2 region of SEQ IDNO.: 32 and the LCDR3 region of SEQ ID NO.: 33, (d) the HCDR1 region ofSEQ ID NO.: 38, the HCDR2 region of SEQ ID NO.: 39, the HCDR3 region ofSEQ ID NO.: 40, the LCDR1 region of SEQ ID NO.: 41, the LCDR2 region ofSEQ ID NO.: 42 and the LCDR3 region of SEQ ID NO.: 43, (e) the HCDR1region of SEQ ID NO.: 48, the HCDR2 region of SEQ ID NO.: 49, the HCDR3region of SEQ ID NO.: 50, the LCDR1 region of SEQ ID NO.: 51, the LCDR2region of SEQ ID NO.: 52 and the LCDR3 region of SEQ ID NO.: 53, (f) theHCDR1 region of SEQ ID NO.: 58, the HCDR2 region of SEQ ID NO.: 59, theHCDR3 region of SEQ ID NO.: 60, the LCDR1 region of SEQ ID NO.: 61, theLCDR2 region of SEQ ID NO.: 62 and the LCDR3 region of SEQ ID NO.: 63,(g) the HCDR1 region of SEQ ID NO.: 88, the HCDR2 region of SEQ ID NO.:89, the HCDR3 region of SEQ ID NO.: 90, the LCDR1 region of SEQ ID NO.:91, the LCDR2 region of SEQ ID NO.: 92 and the LCDR3 region of SEQ IDNO.: 93, (h) the HCDR1 region of SEQ ID NO.: 98, the HCDR2 region of SEQID NO.: 99, the HCDR3 region of SEQ ID NO.: 100, the LCDR1 region of SEQID NO.: 101, the LCDR2 region of SEQ ID NO.: 102 and the LCDR3 region ofSEQ ID NO.: 103, or (i) the HCDR1 region of SEQ ID NO.: 108, the HCDR2region of SEQ ID NO.: 109, the HCDR3 region of SEQ ID NO.: 110, theLCDR1 region of SEQ ID NO.: 111 , the LCDR2 region of SEQ ID NO.: 112and the LCDR3 region of SEQ ID NO.:
 113. 3. An isolated antibody orantibody fragment according to claim 2, wherein said antibody orantibody fragment comprises (a) the variable heavy region of SEQ ID NO.:14 and the variable light region of SEQ ID NO.: 15, (b) the variableheavy region of SEQ ID NO.: 24 and the variable light region of SEQ IDNO.: 25, (c) the variable heavy region of SEQ ID NO.: 34 and thevariable light region of SEQ ID NO.: 35, (d) the variable heavy regionof SEQ ID NO.: 44 and the variable light region of SEQ ID NO.: 45, (e)the variable heavy region of SEQ ID NO.: 54 and the variable lightregion of SEQ ID NO.: 55, (f) the variable heavy region of SEQ ID NO.:64 and the variable light region of SEQ ID NO.: 65, (g) the variableheavy region of SEQ ID NO.: 94 and the variable light region of SEQ IDNO.: 95, (h) the variable heavy region of SEQ ID NO.: 104 and thevariable light region of SEQ ID NO.: 105, or (i) the variable heavyregion of SEQ ID NO.: 114 and the variable light region of SEQ ID NO.:115.
 4. An isolated antibody or antibody fragment which competes with anantibody or antibody fragment of claim 2 for binding to M-CSF.
 5. Anisolated antibody or antibody fragment which binds to the same epitopeas an antibody or antibody fragment of claim
 2. 6. An isolated antibodyaccording to any one of the preceding claim 1, wherein said antibody isof a lgGl subtype which has an effector function which is diminishedcompared to the wild type lgGl subtype.
 7. The isolated antibody ofclaim 6, wherein the aspartic acid residue at position 265 of saidantibody (numbering according to the EU index) is exchanged for analanine residue.
 8. The isolated antibody or antibody fragment accordingto claim 1, wherein said antibody or antibody fragment is a monoclonalantibody or a polyclonal antibody.
 9. The isolated antibody or antibodyfragment according to claim 1, wherein said antibody is a human,humanized or chimeric antibody.
 10. The isolated antibody or antibodyfragment according to claim 1, wherein said antibody is cross-reactiveto cynomolgus M-CSF, mouse M-CSF and/or rat M-CSF.
 11. The isolatedantibody or antibody fragment according to claim 1, for use in medicine.12. A pharmaceutical composition comprising an isolated antibody orantibody fragment of claim 1, and a pharmaceutically acceptable carrier.13. A nucleic acid encoding an antibody or antibody fragment of claim 1.14. A vector comprising the nucleic acid of claim
 13. 15. An isolatedhost cell comprising a vector according to claim 14.